Issue #0 fix: update the readme file for installation guide

README.md

-# Sunbird Program Service
+# Installing Contribution/Program Service on Local Laptop or Desktop
 
-### Prerequisites: Postgres, Node v12+
+## Pre-requisites
 
-## Run Locally
+Before you install program service on your laptop, examine your environment and gather data to ensure an optimal installation experience. Review the [details](https://app.gitbook.com/o/-Mi9QwJlsfb7xuxTBc0J/s/SjljYc0PyD64vGgDlMl4/use/system-requirements) to ensure that the environment has the necessary resources and compliant target systems to successfully install and run Program Service.
 
-Clone the project
-```bash
-    https://github.com/Sunbird-Ed/program-service.git
-```
+## Project Setup
 
-Go to the project directory
-```bash
-    cd program-service
-```
-Install Git Submodules to make use of
-https://github.com/project-sunbird/sunbird-js-utils.git
-```bash
-    git submodule init
-    git submodule update
-```
+1. Clone the project
+    - Fork the [main source code repository](https://github.com/Sunbird-Ed/program-service)
+    - Clone the forked repository and add main source code repository as upstream
 
-Install dependencies
-```bash
-    cd src/
-    npm install
-```
+    ```console
+        git clone {SSH URL of FORKED REPOSITORY}
+        cd {PROJECT-FOLDER}
+        git remote add upstream git@github.com:Sunbird-Ed/program-service.git
+        git fetch upstream
+        git checkout -b {LOCAL-BRANCH-NAME} upstream/{LATEST BRANCH}
+    ```
+    > ***Note***: Stable versions of the program service are available via tags for each release, and the master branch contains latest stable release. For latest stable release [refer](https://github.com/Sunbird-Ed/program-service/branches)
 
-Set the env variable in  `<project-folder>/src/envVariables.js`
-```bash
-    baseURL: process.env.dock_base_url || 'http://dock.sunbirded.org',
-    SUNBIRD_URL: process.env.sunbird_base_url || 'https://dev.sunbirded.org',
-    SUNBIRD_PORTAL_API_AUTH_TOKEN: process.env.sunbird_api_auth_token
-```
+2. Install Git Submodules to make use of https://github.com/project-sunbird/sunbird-js-utils.git
+
+    ```console
+        cd {PROJECT-FOLDER}
+        git submodule init
+        git submodule update
+    ```
+3. Install required dependencies
+
+    ```console
+        cd {PROJECT-FOLDER}/src
+        npm install
+    ```
 
-Start the server
-```bash
+4. Configuring the Environment
+   - Open the file `{PROJECT-FOLDER}/src/envVariables.js` in any available text editor and update the contents of the file so that it contains exactly the following values
+
+    ```console
+    const envVariables = {
+    baseURL: process.env.dock_base_url || <'https://<host for adopter's instance'>,
+    SUNBIRD_URL: process.env.sunbird_base_url || <'https://<host for adopter's instance'>,
+    ....
+    config: {
+        user: process.env.sunbird_program_db_user || "<postgress user>",
+        host: process.env.sunbird_program_db_host || "localhost",
+        database: process.env.sunbird_program_db_name || 'sunbird_programs',
+        password: process.env.sunbird_program_db_password || '<postgress password>',
+       ....
+    },
+    }
+    ```
+
+    > Once the file is updated with appropriate values, then you can proceed with running the application
+
+### Running Application
+
+1. Run the following command in the **{PROJECT-FOLDER}/src** folder
+
+```console
     node app.js
 ```
-the node app will run on `http://localhost:6000`
+
+2. The local HTTP server is launched at `http://localhost:6000`
 
 > Note: To create Postgres table in the local db use the `<project-folder>/programs.sql`