Update README

.env.example

@@ -1,2 +1,2 @@
-TWITTER_USERNAME=# Your Twitter USERNAME
+TWITTER_USERNAME=# Your Twitter Handle
 TWITTER_PASSWORD=# Your Twitter Password

README.md

@@ -2,22 +2,40 @@
 
 ## Setup
 
+1. Install dependencies
+
 ```bash
 pip install -r requirements.txt
 ```
 
+2. Rename `.env.example` to `.env`.
+3. Open .env and update environment variables
+
+```bash
+TWITTER_USERNAME=# Your Twitter Handle (e.g. @username)
+TWITTER_PASSWORD=# Your Twitter Password
+```
+
 ## Usage
 
+- Basic usage
+
 ```bash
 python scraper
 ```
 
-### Arguments
+- Setting maximum number of tweets. defaults to `50`.
+
+```bash
+python scraper --tweets=500       # Scrape 500 Tweets
+```
+
+### Options and Arguments
 
 ```bash
 usage: python scraper [arg]
 
 Arguments           Description
---tweets        : No. of tweets. 50 default.
+--tweets            : No. of tweets. default: 50.
                       e.g. --tweets=500
 ```