Update README.md

Author: ElizaLo

Messenger LiveChat/README.md

@@ -1,3 +1,17 @@
+# Messenger "Live Chat"
+
+<img src="https://github.com/ElizaLo/Practice-Python/blob/master/Messenger%20LiveChat/MainWindow.png" width="440" height="575">
+
+## Requirements
+
+- Qt Designer
+    - [Qt Designer Manual](https://doc-snapshots.qt.io/qt5-dev/qtdesigner-manual.html)
+- `PyQt5`
+    - [PyQt5 Reference Guide](https://www.riverbankcomputing.com/static/Docs/PyQt5/)
+- `Flask`
+- `datetime`
+- `requests`
+
 ## Errors:
 - **socket.error: [Errno 48] Address already in use**
     1. `sudo lsof -i:5000`