Fix indentation. Update readme

Author: varsill

README.md

@@ -1,4 +1,5 @@
 # membrane_tutorials
 Repository which contains text and assets used in Membrane Framework tutorials.
 The following tutorials are now available:
-+ [Videoroom Tutorial](https://tutorials.membraneframework.org/tutorials/videoroom/)
++ [Get Started Tutorial](https://tutorials.membraneframework.org/tutorials/get_started/simple_pipeline.html)
++ [Videoroom Tutorial](https://tutorials.membraneframework.org/tutorials/videoroom/)

get_started/simple_pipeline.md

@@ -244,7 +244,7 @@ Hello.play(pid)
 
 Our [demo with this tutorial](https://github.com/membraneframework/membrane_demo/tree/master/simple_pipeline) contains a file you can play, or you may want to use some [proper "Hello!" recording](https://upload.wikimedia.org/wikipedia/commons/transcoded/6/6f/Voyager_Golden_Record_greeting_in_English.ogg/Voyager_Golden_Record_greeting_in_English.ogg.mp3).
 
-The specified mp3 file should be played on the default device in your system. Please use mp3 that has no ID3 or ID3v2 tags.
+The specified mp3 file should be played on the default device in your system. Please use mp3 that has no ID3 or ID3v2 tags. <br><br>
 [List of tutorials](../../index.md)
 {% endraw %}