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/src/initialize_testbed.ts b/web/gui2-fw-lib/src/initialize_testbed.ts
new file mode 100644
index 0000000..25cca1d
--- /dev/null
+++ b/web/gui2-fw-lib/src/initialize_testbed.ts
@@ -0,0 +1,9 @@
+/**
+ * @fileoverview Provides a script to initialize TestBed before tests are run.
+ * This file should be included in the "runtime_deps" of a "ts_web_test_suite"
+ * rule.
+ */
+import {TestBed} from '@angular/core/testing';
+import {BrowserDynamicTestingModule, platformBrowserDynamicTesting} from '@angular/platform-browser-dynamic/testing';
+
+TestBed.initTestEnvironment(BrowserDynamicTestingModule, platformBrowserDynamicTesting());