add tsc watch for local server and document olcs import

Author: pedroslvieira

CONTRIBUTING.md

@@ -18,6 +18,13 @@ npm start
 browse http://localhost:1234
 ```
 
+### OLCesium import
+The examples use a compiled version of OLCesium. If you want to use the source code directly you can change the import to '../src/olcs.ts'
+
+```typescript
+import OLCesium from 'olcs'; // or '../src/olcs.ts' for source code
+```
+
 ### The `check` target
 
 ```bash

package.json

@@ -12,7 +12,7 @@
     "doc": "typedoc --name ol-cesium --excludeExternals --out apidoc --entryPoints src/olcs.ts --tsconfig ./tsconfig.json",
     "copy-static-dist": "mkdir -p dist/examples/node_modules/ol; mkdir -p dist/examples/node_modules/cesium/Build/; cp examples/inject_ol_cesium.js dist/examples/; cp node_modules/ol/ol.css dist/examples/node_modules/ol/; cp -R node_modules/cesium/Build/CesiumUnminified node_modules/cesium/Build/Cesium dist/examples/node_modules/cesium/Build/; cp -R examples/data dist/examples/",
     "prestart": "rm -rf dist; npm run copy-static-dist",
-    "start": "parcel serve ./examples/index.html --dist-dir dist/examples --no-autoinstall",
+    "start": "parcel serve ./examples/index.html --dist-dir dist/examples --no-autoinstall & tsc --watch",
     "serve-built-examples": "python3 -m http.server --directory dist 12345"
   },
   "targets": {