Some additional info to support integration

Some additional words for the impatient and shallow reader like myself, when trying to use this great package.

Author: Tommertom

README.md

@@ -56,6 +56,12 @@ or install from NPM:
 npm install sveltefire
 ````
 
+And do not forget to install firebase dependencies
+```sh
+npm install firebase
+```
+Please read the [Installation guide](https://github.com/codediodeio/sveltefire/blob/master/docs/install.md) for any frequenty encountered issues when integrating in a svelte project.
+
 Create a project at https://firebase.google.com/ and grab your web config:
 
 ![firebase config](https://firebasestorage.googleapis.com/v0/b/firestarter-96e46.appspot.com/o/project-config.PNG?alt=media&token=5eabb205-7ba2-4fc3-905f-e9547055e754)