updated js programming readme

Signed-off-by: Jonathan Treffler <mail@jonathan-treffler.de>

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+# JavaScript Development
+JavaScript is built and minified using webpack.
+
+Therefore you need to install **Node.js 6+ and npm**.
+
+Then install the local dependencies by running:
+
+	npm install
+
+## Tasks
+The following tasks are available:
+
+* **Build the JavaScript**:
+
+        npm run build
+
+* **Build the JavaScript in Dev Mode**:
+
+				npm run build
+
+* **Watch for changes and build JavaScript**:
+
+        npm run watch
+
+* **Run JavaScript unit tests**:
+
+        npm run karma
+
+* **Watch for changes and run JavaScript unit tests**:
+
+        npm run watch-karma