(docs): Added todo doc

TODO.md

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+## **📋 TODO Roadmap**
+
+### **Phase 1: Core Foundation** ⏳
+- [ ] **Project Setup**
+  - [ ] Initialize Python project structure
+  - [ ] Set up virtual environment and dependencies
+  - [ ] Create base workout and tracker models
+  - [ ] Implement local JSON storage
+
+- [ ] **Basic GUI (Tkinter)**
+  - [ ] Main window layout
+  - [ ] Manual workout entry form
+  - [ ] Workout list display
+  - [ ] Basic stats (total/remaining distance)
+
+- [ ] **Core Workout Tracking**
+  - [ ] Workout model (date, activity, distance, duration, notes, power, cadence)
+  - [ ] Tracker logic (totals, weekly summaries, goal progress)
+  - [ ] CRUD operations for workouts
+  - [ ] Data validation and error handling
+
+---
+
+### **Phase 2: Equipment Management** 🔧
+- [ ] **Equipment Discovery & Selection**
+  - [ ] Scan for all available BLE/ANT+ devices
+  - [ ] Device type detection (trainer vs power meter vs HR monitor)
+  - [ ] Equipment selection UI (dropdown/list with device info)
+  - [ ] Save preferred equipment to user settings
+
+- [ ] **Multi-Device Support**
+  - [ ] Connect to multiple devices simultaneously (trainer + HR + cadence)
+  - [ ] Handle device priority (e.g., power from trainer vs power meter)
+  - [ ] Device connection status indicators
+  - [ ] Automatic reconnection on disconnect
+
+- [ ] **Equipment Profiles**
+  - [ ] Create equipment profiles (e.g., "Indoor Setup", "Outdoor Setup")
+  - [ ] Quick-switch between profiles
+  - [ ] Profile-specific calibration settings
+  - [ ] Equipment-specific data recording preferences
+
+---
+
+### **Phase 3: Saris H3 Integration** 🔄
+- [ ] **Bluetooth Low Energy Connection**
+  - [ ] Device discovery and pairing
+  - [ ] Connect to Saris H3 via `bleak`
+  - [ ] Handle connection errors and reconnection
+
+- [ ] **Live Data Capture**
+  - [ ] Read power data (Cycling Power Service)
+  - [ ] Read speed/cadence (Fitness Machine Service)
+  - [ ] Real-time display in GUI
+  - [ ] Data logging during rides
+
+- [ ] **Automatic Ride Detection**
+  - [ ] Start ride detection (power > threshold)
+  - [ ] Stop ride detection (power = 0 for X seconds)
+  - [ ] Auto-save completed rides to tracker
+  - [ ] Ride summary popup
+
+- [ ] **Trainer Control** (Future)
+  - [ ] ERG mode (set target watts)
+  - [ ] Resistance/slope control
+  - [ ] Structured workout execution
+
+---
+
+### **Phase 4: Data Visualization** 📊
+- [ ] **Charts and Analytics**
+  - [ ] Weekly mileage chart (matplotlib)
+  - [ ] Power curve visualization
+  - [ ] Progress toward goal chart
+  - [ ] Training load trends (if data available)
+
+- [ ] **Enhanced UI**
+  - [ ] Tabbed interface (Overview, Rides, Charts, Settings)
+  - [ ] Dark mode toggle
+  - [ ] Responsive layout improvements
+
+---
+
+### **Phase 5: External Integrations** 🔗
+- [ ] **Intervals.icu Integration**
+  - [ ] API authentication (personal API key)
+  - [ ] Push workouts to Intervals.icu
+  - [ ] Pull planned workouts
+  - [ ] Sync status indicators
+  - [ ] Error handling for API calls
+
+- [ ] **COROS Training Hub Integration**
+  - [ ] Research API availability (likely requires reverse engineering)
+  - [ ] Implement authentication
+  - [ ] Push/pull workout data
+  - [ ] Fallback: FIT/TCX file export for manual upload
+
+- [ ] **File Import/Export**
+  - [ ] Import FIT/TCX/GPX files (outdoor rides)
+  - [ ] Export to CSV
+  - [ ] Backup/restore functionality
+
+---
+
+### **Phase 6: Polish & Features** ✨
+- [ ] **User Experience**
+  - [ ] Settings panel (goals, API keys, preferences)
+  - [ ] Workout editing/deletion
+  - [ ] Search and filter workouts
+  - [ ] Keyboard shortcuts
+
+- [ ] **Advanced Features**
+  - [ ] Multi-user profiles
+  - [ ] Workout planning calendar
+  - [ ] Training zones configuration
+  - [ ] Custom goal setting
+
+---
+
+### **Phase 7: Future Enhancements** 🚀
+- [ ] **Cloud & Mobile**
+  - [ ] Cloud sync (Dropbox/Google Drive)
+  - [ ] Mobile companion app
+  - [ ] Web dashboard
+
+- [ ] **Advanced Analytics**
+  - [ ] Training Stress Score (TSS) calculation
+  - [ ] Chronic Training Load (CTL/ATL)
+  - [ ] Performance modeling
+  - [ ] Race prediction