made readme slightly helpful

README.md

@@ -1,2 +1,16 @@
-# 2 Chainz Rest
+# 2 Chainz Twitter Bot
 
+Posts weekly tweets to the [@chainz_bot](https://twitter.com/chainz_bot) twitter account. More information about this project at [2.chainz.rest](2.chainz.rest)
+
+## Usage
+
+You need to add your twitter api keys to a `keys.py` file in this directory with the following format:
+
+```python
+keys = {
+    "API": "API_KEY_HERE",
+    "API_SECRET": "API_SECRET_KEY_HERE",
+    "TOKEN": "TOKEN_KEY_HERE",
+    "TOKEN_SECRET": "TOKEN_SECRET_KEY_HERE",
+}
+```