Adding upstream version 2.12.1.upstream/2.12.1upstream

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

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+# About Icinga Web 2 <a id="about"></a>
+
+Icinga Web 2 is a powerful PHP framework for web applications that comes in a clean and reduced design.
+It's fast, responsive, accessible and easily extensible with modules.
+
+## Installation <a id="about-installation"></a>
+
+Icinga Web 2 can be installed easily from packages from the official package repositories.
+Setting it up is also easy with the web based setup wizard.
+
+See [here](02-Installation.md#installation) for more information about the installation.
+
+## Configuration <a id="about-configuration"></a>
+
+Icinga Web 2 can be configured via the user interface and .ini files.
+
+See [here](03-Configuration.md#configuration) for more information about the configuration.
+
+## Authentication <a id="about-authentication"></a>
+
+With Icinga Web 2 you can authenticate against relational databases, LDAP and more.
+These authentication methods can be easily configured (via the corresponding .ini file).
+
+See [here](05-Authentication.md#authentication) for more information about
+the different authentication methods available and how to configure them.
+
+## Authorization <a id="about-authorization"></a>
+
+In Icinga Web 2 there are permissions and restrictions to allow and deny (respectively)
+roles to view or to do certain things.
+These roles can be assigned to users and groups.
+
+See [here](06-Security.md#security) for more information about authorization
+and how to configure roles.
+
+## User preferences <a id="about-preferences"></a>
+
+Besides the global configuration each user has individual configuration options
+like the interface's language or the current timezone.
+They can be stored either in a database or in .ini files.
+
+See [here](07-Preferences.md#preferences) for more information about a user's preferences
+and how to configure their storage type.
+
+## Modules
+
+Modules extend Icinga Web 2 with additional functionality. They allow the integration of
+capabilities into existing views and even other modules. Be it a graph provider such as
+[Graphite](https://github.com/Icinga/icingaweb2-module-graphite) or a UI for the Icinga 2
+configuration like the [Director](https://github.com/Icinga/icingaweb2-module-director).
+
+See [here](08-Modules.md#modules) for information on how to install and configure modules.
+
+### The monitoring module <a id="about-monitoring"></a>
+
+> **Note for Icinga DB Users**
+>
+> This module is only for the IDO backend. Use [Icinga DB Web](https://github.com/Icinga/icingadb-web) instead.
+
+This is the core module for most Icinga Web 2 users.
+
+It provides an intuitive user interface for monitoring with Icinga 2.
+There are lots of list and detail views (e.g. for hosts and services)
+you can sort and filter depending on what you want to see.
+
+You can also control the monitoring process itself by sending external commands to Icinga.
+Most such actions (like rescheduling a check) can be done with just a single click in the UI.
+
+More details about this module can be found in [this chapter](../modules/monitoring/doc/01-About.md#monitoring-module-about).
+
+### Documentation <a id="about-documentation"></a>
+
+With the documentation module you can read the documentation of the framework (and any module) directly in the user interface.
+
+The module can also export the documentation to PDF.
+
+More details about this module can be found in [this chapter](../modules/doc/doc/01-About.md#doc-module-about).
+
+### Translation <a id="about-translation"></a>
+
+Icinga Web 2 and all modules by Icinga utilize gettext to provide translations into other languages from the default
+English (en_US). However, the actual language specific files (locales) are not separately included in every project.
+
+Icinga uses a central repository to manage locales: https://github.com/Icinga/L10n
+
+If you want to provide or update a translation for your own language, please head over there where you will find
+[instructions](https://github.com/Icinga/L10n/blob/main/CONTRIBUTING.md) on how to contribute.
+
+## Accessibility <a id="about-accessibility"></a>
+
+In the Icinga Web 2 interface even the blind can see - 
+easy navigation with a screen reader and specific themes for different kinds of vision deficiencies
+make it possible for everyone to monitor their systems without impairments.