Add .bazelversion

Change-Id: I0af920c180fef6d1c176d0ca98c2902f920f54b8
diff --git a/.bazelversion b/.bazelversion
new file mode 100644
index 0000000..8862dba
--- /dev/null
+++ b/.bazelversion
@@ -0,0 +1 @@
+1.0.0rc2