chore: Add readme.

Author: rozari0

ptbcontrib/true_reply_filter/README.md

@@ -0,0 +1,21 @@
+# True Reply Filter
+
+Provides a `TRUE_REPLY_FILTER` that allows you to filter only **real replies** in Telegram groups and forum topics, ignoring topic starters.
+
+```python
+from telegram.ext import MessageHandler
+from ptbcontrib.true_reply_filter import TRUE_REPLY_FILTER
+
+MessageHandler(
+    TRUE_REPLY_FILTER,
+    callback
+)
+```
+
+## Requirements
+
+*   `python-telegram-bot>=20.0`
+
+## Authors
+
+*   [Daniel](https://github.com/rozari0)