added test package

libs/test-snippets/README.md

@@ -0,0 +1 @@
+run ``pxt testdir ../../buit/docs/blocks`` from this folder

libs/test-snippets/pxt.json

@@ -0,0 +1,13 @@
+{
+    "name": "test-snippets",
+    "description": "A test project for doc snippets",
+    "installedVersion": "file:.",
+    "files": [
+        "main.ts"
+    ],
+    "public": true,
+    "dependencies": {
+        "microbit": "file:../microbit",
+        "microbit-radio": "file:../microbit-radio"
+    }
+}