added README for this issue

Author: Chloe White

mood_tracker/README.md

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+# Habit Tracker App
+
+A simple Habit Tracker application using Python and Tkinter.
+
+## Features
+- Add and track habits (placeholder)
+- Habit streaks (placeholder)
+- Analyze progress (placeholder)
+- Exit button
+
+## How to Use
+1. Run `python habit_tracker.py`
+2. Enter a habit in the input box
+3. Click "Add Habit"
+4. Use placeholder functions for streaks and analysis
+5. Click "Exit" to close the app