Update README

README.md

@@ -4,6 +4,31 @@ Have some spam on your profile? Maybe an association with someone you want to ge
 
 ## Usage
 
+```
+usage: detweet.py [-h] --csv CSV [--dry] [--before BEFORE] [--after AFTER]
+                  pattern [pattern ...]
+
+Delete tweets en masse
+
+positional arguments:
+  pattern          regular expressions to match
+
+optional arguments:
+  -h, --help       show this help message and exit
+  --csv CSV        the path to your tweets.csv file located in your twitter
+                   archive
+  --dry            do a dry run
+  --before BEFORE  match tweets before this date (YYYY-M-D)
+  --after AFTER    match tweets after this date (YYYY-M-D)
+```
+
+### Installation
+
+1. Clone the repository: `git clone https://github.com/landaire/detweet.git`
+2. Create a python3 virtualenv: `virtualenv -p python3 venv`
+3. Activate the virtualenv: `source bin/activate`
+4. Install the requirements: `pip install -r requirements.txt`
+
 ### Set up your API credentials
 
 1. Create an application for use with this script (https://dev.twitter.com/apps)