doc: README for demo, explain about running tests

Author: urish

README.md

@@ -6,11 +6,25 @@ JavaScript implementation of the AVR 8-bit architecture
 
 ## Running the demo project
 
-The demo project allows you to edit and run Arduino code. It includes 2 simulated LEDs
-connected to pins 12 and 13 (PB4 and PB5). 
+The demo project allows you to edit Arduino code, compile it, and run it in the simulator.
+It also simulates 2 LEDs connected to pins 12 and 13 (PB4 and PB5). 
 
 To run the demo project, check out this repository, run `npm install` and then `npm start`.
 
+## Running the tests
+
+Run the tests once:
+
+```
+npm test
+```
+
+Run the tests of the files you modified since last commit (watch mode):
+
+```
+npm run test:watch
+```
+
 ## License
 
 Copyright (C) 2019, Uri Shaked. The code is released under the terms of the MIT license.

demo/README.md

@@ -0,0 +1,9 @@
+# AVR8js Demo
+
+AVR8js + Monaco Editor. To run this demo:
+
+1. Install dependencies: `npm install`
+2. Start the code: `npm start`
+3. Go to http://localhost:1234/ and start tinkering
+
+The demo is configured to automatically reload the app whenever you change the code.

package.json

@@ -12,7 +12,8 @@
     "prepare": "npm run build",
     "start": "parcel demo/src/index.html -d demo/build",
     "lint": "tslint --project tsconfig.json",
-    "test": "jest"
+    "test": "npm run lint && jest",
+    "test:watch": "jest --watch"
   },
   "files": [
     "dist"