Update README.txt

Add in reference to running setupDecompWorkspace to get decompiled classes
Write the correct default value for StringList comments in the config
Merge pull request #1330 from bonii-xx/master

Write the correct default value for StringList comments in the config
Merge pull request #1300 from zlyfire/patch-1

Update README.txt
FML
Merge branch 'master' of https://github.com/MinestrapTeam/MinecraftForge