updated readme for app build+launch instructions

README.md

@@ -6,4 +6,14 @@ Run inside projet folder the command:
   ./build-image.sh
 ```
 
-If everything goes well, you can now move to ```docker/images/payara``` folder and 
+If everything goes well, you can run
+```bash
+docker-compose up
+```
+
+Now, your terminal is stuck. Great. Open <http://localhost:4848>
+
+1. Accept the risks
+2. Click on ```Applications``` in sidebar
+3. Look for ```launch```
+4. Forget the opened window, click [this](http://localhost:8080/stack) to see our app