GUI2 add a karma.conf.js for unit tests

Change-Id: I2db9e9fcbaa6b6cf0dcdae38bff8628c0e706cf4
diff --git a/.bazelversion b/.bazelversion
new file mode 100644
index 0000000..4a36342
--- /dev/null
+++ b/.bazelversion
@@ -0,0 +1 @@
+3.0.0