Add installation and usage to Readme

README.md

@@ -2,3 +2,37 @@
 
 Encrypt messages with a randomly-generated [one-time pad](https://en.wikipedia.org/wiki/One-time_pad)! Send your encrypted message along with your pad,
 and your friend can decrypt the message. Just be sure you destroy the pad when you're done!
+
+## Installation
+
+Clone with git:
+
+```
+> git clone https://github.com/Alamantus/otp-generator.git
+```
+
+Go to the directory:
+
+```
+> cd otp-generator
+```
+
+Install dependencies with NPM or Yarn:
+
+```
+> yarn
+// OR
+> npm install
+```
+
+## Usage
+
+Run it:
+
+```
+npm run dev
+```
+
+Open your browser and go to [http://localhost:1234](http://localhost:1234).
+
+Use it!