Added BUILD file for gui2-fw-lib bazel build

This is another step along the way of having Native Bazel builds for Angular
Not fully there yet - waiting for Angular v9 in next 2 weeks
but don't want to wait that long to merge all of this

For most people the main concern is updates to WORKSPACE

Change-Id: I28170b8f8daaa2959327c259fe6a10df075113bb
diff --git a/web/gui2-fw-lib/.gitignore b/web/gui2-fw-lib/.gitignore
index 14079de..143aa64 100644
--- a/web/gui2-fw-lib/.gitignore
+++ b/web/gui2-fw-lib/.gitignore
@@ -40,3 +40,6 @@
 Thumbs.db
 
 projects/gui2-fw-lib/src/assets
+
+.pki/
+.cache/