Update README.md

build notes

Author: Sean McVeigh

README.md

@@ -5,3 +5,8 @@ Our intent with this repository is:
   2. To enable the larger community to build their own binaries which will run on BlackBerry 10 / PlayBook devices
   3. To prepare and formalize our patch-set, in preparation for a push to the upstream Python.org repository.  Community assistance with this effort will be greatly appreciated, as internal commitments have most RIM employees tied up right now :)
 
+Build notes
+  1. Install BlackBerry 10 NDK tools and make sure environment variables are set up
+  2. Seems we need a case-sensitive build environment (partition accordingly on OSX, or create a DMG to build in)
+  3. May need to install Mercurial (Hg)
+  4. May need an existing host-native python installation