Setup pw_web_ui with Bazel and Jasmine

Initialize the pw_web_ui package and add Bazel as a build system. Add a single example test in `src/transport/web_serial_transport_test.ts` to verify Bazel can build and run Jasmine tests.

HAS_TO_BE_LARGE=Initializing a new package. Most of this is due to yarn.lock.

Change-Id: Ie3adbdba5a91de9a5f16205be8077bafb3a1fee3
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..e5a1881
--- /dev/null
+++ b/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "pigweed",
+  "version": "0.0.1",
+  "description": "An open source collection of embedded-targeted libraries",
+  "author": "",
+  "license": "Apache-2.0",
+  "devDependencies": {
+    "@bazel/jasmine": "^1.7.0",
+    "@bazel/typescript": "^1.7.0",
+    "@types/jasmine": "^3.5.10",
+    "jasmine": "^3.5.0",
+    "typescript": "^3.9.3"
+  }
+}