Update README.md

Author: mostlypanda

README.md

@@ -6,6 +6,47 @@ Upto now I have uploadedbelow functionalities
 2. Rest Api's for user sign-up, login, logout and user profile using node-js, expess, mongodb along with jwt token as an authentication agent
 3. OTP verification here complete form is designed and when user filled and submit the form an otp will be sent to filled email of user using nodemailer module and smtp method 
 then user has to enter the received otp for further verification
+---
+## Requirements
+
+For development, you will need Node.js and a node global package, Yarn, installed in your environement and many other packages also which are stated further
+
+### Node
+- #### Node installation on Windows
+
+  Just go on [official Node.js website](https://nodejs.org/) and download the installer.
+Also, be sure to have `git` available in your PATH, `npm` might need it (You can find git [here](https://git-scm.com/)).
+
+- #### Node installation on Ubuntu
+
+  You can install nodejs and npm easily with apt install, just run the following commands.
+
+      $ sudo apt install nodejs
+      $ sudo apt install npm
+
+- #### Other Operating Systems
+  You can find more information about the installation on the [official Node.js website](https://nodejs.org/) and the [official NPM website](https://npmjs.org/).
+
+If the installation was successful, you should be able to run the following command.
+
+    $ node --version
+    v8.11.3
+
+    $ npm --version
+    6.1.0
+
+If you need to update `npm`, you can make it using `npm`! Cool right? After running the following command, just open again the command line and be happy.
+
+    $ npm install npm -g
+
+###
+### Yarn installation
+  After installing node, this project will need yarn too, so just run the following command.
+
+      $ npm install -g yarn
+
+---
+
 
 # to run any above utility or api
 clone the above repository by using