Add basic webtesting example.

Also switch the angular example to use ts_library instead of ts_project.

Change-Id: Ib94c7010bd2af4036d1a04efaf95bbab43cb9ef0
Signed-off-by: Alex Perry <alex.perry96@gmail.com>
diff --git a/build_tests/basic.ts b/build_tests/basic.ts
new file mode 100644
index 0000000..6ddac49
--- /dev/null
+++ b/build_tests/basic.ts
@@ -0,0 +1,6 @@
+/**
+ * Computes the sum of the input values
+ */
+export function add(x: number, y: number): number {
+  return x + y;
+}