Updating app files

docs/starter/installing.md

@@ -0,0 +1,27 @@
+# Installing
+
+Assuming you’ve already installed [Node.js](https://nodejs.org/en), create a directory to hold your application, and make that your working directory.
+
+```sh
+$ mkdir myapp
+
+$ cd myapp
+```
+
+Use the npm init command to create a package.json file for your application. 
+
+```sh
+$ npm init -y
+```
+
+Install ABACKEND in the `myapp` directory and save it in the dependencies list.
+
+```sh
+$ npm i abackend
+```
+
+To install ABACKEND temporarily and not add it to the dependencies list.
+
+```sh
+$ npm install abackend --no-save
+```