Merge branch 'feature/Provide-an-about-md-9379'

resolves #9379

doc/about.md

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+# <a id="about"></a> About Icinga Web 2
+
+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.
+
+## <a id="about-monitoring"></a> The monitoring module
+
+This is the core module for most Icinga Web 2 users.
+
+It provides an intuitive user interface for monitoring with Icinga (1 and 2).
+Especially 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.
+
+## <a id="about-installation"></a> Installation
+
+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](installation#installation) for more information about the installation.
+
+## <a id="about-configuration"></a> Configuration
+
+Icinga Web 2 can be configured via the user interface and .ini files.
+
+See [here](configuration#configuration) for more information about the configuration.
+
+## <a id="about-authentication"></a> Authentication
+
+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](authentication#authentication) for more information about
+the different authentication methods available and how to configure them.
+
+## <a id="about-authorization"></a> Authorization
+
+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](security#security) for more information about authorization
+and how to configure roles.
+
+## <a id="about-preferences"></a> User preferences
+
+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](preferences#preferences) for more information about a user's preferences
+and how to configure their storage type.
+
+## <a id="about-documentation"></a> Documentation
+
+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.
+
+## <a id="about-translation"></a> Translation
+
+With the translation module every piece of text in the user interface (of the framework itself and any module) can be translated to a language of your choice.
+
+Currently provided languages:
+
+* German
+* Italian
+* Portuguese