Adding upstream version 1.1.1.upstream/1.1.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# Contributing
+
+Icinga is an open source project and lives from your ideas and contributions.
+
+There are many ways to contribute, from improving the documentation, submitting
+bug reports and features requests or writing code to add enhancements or fix bugs.
+
+#### Table of Contents
+
+1. [Introduction](#introduction)
+2. [Fork the Project](#fork-the-project)
+3. [Branches](#branches)
+4. [Commits](#commits)
+5. [Pull Requests](#pull-requests)
+6. [Testing](#testing)
+7. [Source Code Patches](#source-code-patches)
+8. [Documentation Patches](#documentation-patches)
+
+## Introduction
+
+Please consider our [roadmap](https://github.com/Icinga/icingadb-web/milestones) and
+[open issues](https://github.com/icinga/icingadb-web/issues) when you start contributing
+to the project.
+
+Before starting your work on Icinga DB Web, you should [fork the project](https://help.github.com/articles/fork-a-repo/)
+to your GitHub account. This allows you to freely experiment with your changes.
+When your changes are complete, submit a [pull request](https://help.github.com/articles/using-pull-requests/).
+All pull requests will be reviewed and merged if they suit some general guidelines:
+
+* Changes are located in a topic branch
+* For new functionality, proper tests are written
+* Changes should follow the existing coding style and standards
+
+Please continue reading in the following sections for a step by step guide.
+
+## Fork the Project
+
+[Fork the project](https://help.github.com/articles/fork-a-repo/) to your GitHub account
+and clone the repository:
+
+```
+git clone git@github.com:jdoe/icingadb-web.git
+cd icingadb-web
+```
+
+Add a new remote `upstream` with this repository as value.
+
+```
+git remote add upstream https://github.com/icinga/icingadb-web.git
+```
+
+You can pull updates to your fork's default branch:
+
+```
+git fetch --all
+git pull upstream HEAD
+```
+
+Please continue to learn about [branches](#branches).
+
+## Branches
+
+Choosing a proper name for a branch helps us identify its purpose and possibly
+find an associated bug or feature.
+Generally a branch name should include a topic such as `fix` or `feature` followed
+by a description and an issue number if applicable. Branches should have only changes
+relevant to a specific issue.
+
+```
+git checkout -b fix/service-template-typo-1234
+git checkout -b feature/config-handling-1235
+```
+
+Continue to apply your changes and test them. More details on specific changes:
+
+* [Source Code Patches](#source-code-patches)
+* [Documentation Patches](#documentation-patches)
+
+## Commits
+
+Once you've finished your work in a branch, please ensure to commit
+your changes. A good commit message includes a short topic, additional body
+and a reference to the issue you wish to solve (if existing).
+
+Fixes:
+
+```
+Fix missing style in detail view
+
+refs #4567
+```
+
+Features:
+
+```
+Add DateTime picker
+
+refs #1234
+```
+
+You can add multiple commits during your journey to finish your patch.
+Don't worry, you can squash those changes into a single commit later on.
+
+## Pull Requests
+
+Once you've committed your changes, please update your local default
+branch and rebase your fix/feature branch against it before submitting a PR.
+
+```
+git checkout main
+git pull upstream HEAD
+
+git checkout fix/style-detail-view-5678
+git rebase main
+```
+
+Once you've resolved any conflicts, push the branch to your remote repository.
+It might be necessary to force push after rebasing - use with care!
+
+New branch:
+```
+git push --set-upstream origin fix/style-detail-view-5678
+```
+
+Existing branch:
+```
+git push -f origin fix/style-detail-view-5678
+```
+
+You can now either use the [hub](https://hub.github.com) CLI tool to create a PR, or navigate
+to your GitHub repository and create a PR there.
+
+The pull request should again contain a telling subject and a reference
+with `fixes` to an existing issue id if any. That allows developers
+to automatically resolve the issues once your PR gets merged.
+
+```
+hub pull-request
+
+<a telling subject>
+
+fixes #1234
+```
+
+Thanks a lot for your contribution!
+
+
+### Rebase a Branch
+
+If you accidentally sent in a PR which was not rebased against the upstream default branch,
+developers might ask you to rebase your PR.
+
+First off, fetch and pull the default branch.
+
+```
+git checkout main
+git fetch --all
+git pull upstream HEAD
+```
+
+Then change to your working branch and start rebasing it against the default:
+
+```
+git checkout fix/style-detail-view-5678
+git rebase main
+```
+
+If you are running into a conflict, rebase will stop and ask you to fix the problems.
+
+```
+git status
+
+  both modified: path/to/conflict.php
+```
+
+Edit the file and search for `>>>`. Fix, build, test and save as needed.
+
+Add the modified file(s) and continue rebasing.
+
+```
+git add path/to/conflict.php
+git rebase --continue
+```
+
+Once succeeded ensure to push your changed history remotely.
+
+```
+git push -f origin fix/style-detail-view-5678
+```
+
+
+If you fear to break things, do the rebase in a backup branch first and later replace your current branch.
+
+```
+git checkout fix/style-detail-view-5678
+git checkout -b fix/style-detail-view-5678-rebase
+
+git rebase main
+
+git branch -D fix/style-detail-view-5678
+git checkout -b fix/style-detail-view-5678
+
+git push -f origin fix/style-detail-view-5678
+```
+
+### Squash Commits
+
+> **Note:**
+>
+> Be careful with squashing. This might lead to non-recoverable mistakes.
+>
+> This is for advanced Git users.
+
+Say you want to squash the last 3 commits in your branch into a single one.
+
+Start an interactive (`-i`)  rebase from current HEAD minus three commits (`HEAD~3`).
+
+```
+git rebase -i HEAD~3
+```
+
+Git opens your preferred editor. `pick` the commit in the first line, change `pick` to `squash` on the other lines.
+
+```
+pick e4bf04e47 Fix style detail view
+squash d7b939d99 Tests
+squash b37fd5377 Doc updates
+```
+
+Save and let rebase to its job. Then force push the changes to the remote origin.
+
+```
+git push -f origin fix/style-detail-view-5678
+```
+
+
+## Testing
+
+TBD
+
+## Source Code Patches
+
+Icinga DB Web is written in PHP, LESS and JavaScript.
+
+## Documentation Patches
+
+The documentation is written in GitHub flavored [Markdown](https://guides.github.com/features/mastering-markdown/).
+It is located in the `doc/` directory and can be edited with your preferred editor. You can also
+edit it online on GitHub.
+
+```
+vim doc/02-Installation.md
+```