Add more documentation

client/src/main/resources/html/docs/Avidemux.md

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+#### Avidemux
+[Avidemux](http://avidemux.sourceforge.net/) is a free video editor designed for simple cutting, filtering and encoding tasks.
+It is available for all major platforms. Avidemux can be used to manually remux recordings.
+
+1. Open the .ts file with Avidemux
+2. On the left side select **Copy** for the Video- and Audio-Codec
+3. Select your preferred output format, e.g. MP4v2, MKV or AVI
+4. Save the video under a different name
+5. Enjoy!

client/src/main/resources/html/docs/FFmpeg.md

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+#### FFmpeg
+[FFmpeg](https://ffmpeg.org) is a multimedia framework, which comes with a very powerful command line tool to process multimedia files.
+It is available for all major platforms. FFmpeg can be used to manually and automatically remux recordings.
+
+##### Installation
+* Linux: Use the package manager of your distribution to find and install ffmpeg
+* Windows:
+    1. Download the latest stable version from the homepage
+       (You probably want to get the 64-bit statically linked build)
+    2. Extract the zip
+    3. Add the bin directory to your PATH environment variable
+       (If you don't know what I'm talking about, do a Youtube search for FFmpeg installation on Windows or something like that)
+* macOS: See Windows
+
+##### Manual remuxing
+* Open a terminal (command prompt) and cd into the directory of the recording
+* Run FFmpeg:
+
+    `ffmpeg -i AwesomeGirl_-2019-04-04_15-46-19_195.ts -c:v copy -c:a copy AwesomeGirl_-2019-04-04_15-46-19_195.mp4`
+
+    As you can see, the codecs for video and audio are set to copy, which means, that the recording is not reencoded, but just "copied" to
+  another container format. You could also use mkv or avi for the output file suffix and FFmpeg would create that respective file. Depending
+  on your hardware specs and the length of the recording, this process probably takes a few seconds up to a couple of minutes.
+  
+##### Automatic remuxing
+FFmpeg can also be used to automatically remux recordings. ctbrec provides a [post-processing](/docs/PostProcessing.md) mechanism for this purpose.  

client/src/main/resources/html/docs/MKVToolNix.md

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+#### MKVToolNix
+[MKVToolNix](https://mkvtoolnix.download/) is a collection of tools for the Matroska media container format.
+It is available for all major platforms. MKVToolNix can be used to manually remux recordings and convert them
+from .ts to .mkv.
+
+1. Open the .ts file with MKVToolNix GUI
+2. Define the output file at the bottom
+3. **Start multiplexing**
+4. Enjoy!

client/src/main/resources/html/docs/PostProcessing.md

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+#### Post-Processing

client/src/main/resources/html/docs/QuestionsAndAnswers.md

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+#### How can I convert the recordings to mp4 / mkv?
+To convert the files to another format, you have to remux them. You don't have to reencode them, since the
+files (usually, have not seen an exception yet) already contain H.264 video and AAC audio. You can remux the
+files manually with tools like [Avidemux](/docs/Avidemux.md), [MKVToolNix](/docs/MKVToolNix.md) or 
+[FFmpeg](/docs/FFmpeg.md) or use one of the post-processing scripts.
+
+#### Streams are not getting recorded even though the model is online
+- Is "Leave space on device set" and do you have enough space left?
+- Is "Maximum resolution" set? In case maximum resolution is set and ctbrec cannot determine the 
+  resolution of a stream, the stream will not be recorded.
+- Is "Concurrent Recordings" set and you reached the maximum?
+
+#### How can I playback the recorded .ts files?
+Use one of the following players:
+- [mpv](https://mpv.io/installation/)
+- [VLC](https://www.videolan.org/vlc/)
+
+#### How can I playback the server recordings?
+Use one of the following players:
+- [mpv](https://mpv.io/installation/)
+- [VLC](https://www.videolan.org/vlc/)
+
+If you have direct access to the recordings you can use these players and open the playlist.m3u8.
+Otherwise use the ctbrec client. Set the **Record Location** to **Remote** and configure your server.
+Under **General** select the **Player** of your choice. Then you can start the playback directly from the
+**Recordings** tab.