Add draft RBTools 2.0 release notes.
This change adds draft release notes for the upcoming RBTools 2.0
release.
Testing Done:
Built docs and viewed the output.
Reviewed at
RBTools Release Notes
=====================
+2.0 Releases
+============
+
+.. toctree::
+ :maxdepth: 1
+
+ 2.0
+
1.0 Releases
============
