Merge pull request #7 from twz123/update-readme

Update general section of README

README.md

@@ -1,8 +1,22 @@
 # obs-v4l2sink
 
-This plugin provides output ability to v4l2 device . It is basically a Linux version of [obs-virtual-cam](https://github.com/CatxFish/obs-virtual-cam), but only contains the video sink part. You can use it with [v4l2loopback](https://github.com/umlaeute/v4l2loopback) to achieve cross-program image transfer between obs-studio and third party software supporting Video4Linux. 
+An [OBS Studio][obs-proj] plugin that provides output capabilities to a
+Video4Linux2 device. It is basically a Linux version of [obs-virtual-cam][vcam],
+but only contains the video sink part. You can use it with
+[v4l2loopback][v4l2loopback] to achieve cross-program video transfer between OBS
+Studio and third party software supporting Video4Linux2, e.g. to present an OBS
+session in proprietary browser-based conferencing systems by selecting the OBS
+session as a webcam.
 
-# Usage with v4l2loopback
+The idea for this plugin originated from the discussions around [obs-virtual-cam
+issue #17][vcam#17].
+
+[obs-proj]: https://obsproject.com/
+[vcam]: https://github.com/CatxFish/obs-virtual-cam
+[v4l2loopback]: https://github.com/umlaeute/v4l2loopback
+[vcam#17]: https://github.com/CatxFish/obs-virtual-cam/issues/17
+
+## Usage with v4l2loopback
 
 - Make sure to [load the v4l2loopback module][run-v4l2loopback] and check the Device Path.
  - If using Chrome or Chromium you must use the option `exclusive_caps=1`.
@@ -14,21 +28,27 @@ This plugin provides output ability to v4l2 device . It is basically a Linux ver
 
 [run-v4l2loopback]: https://github.com/umlaeute/v4l2loopback#run
 
-# Build
+## Build
+
 - Install QT
+
 ```
 sudo apt install qtbase5-dev
 ```
+
 - Get obs-studio source code
+
 ```
 git clone --recursive https://github.com/obsproject/obs-studio.git
 ```
+
 - Build plugins
+
 ```
 git clone https://github.com/CatxFish/obs-v4l2sink.git
 cd obs-v4l2sink
 mkdir build && cd build
 cmake -DLIBOBS_INCLUDE_DIR="../obs-studio/libobs" -DCMAKE_INSTALL_PREFIX=/usr ..
 make -j4
 sudo make install
-``` 
+```