Adding localization feature

templates/localization/README.md.template

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+# {{PROJECT_NAME}} - Localization Template
+
+Grid-based robot localization with sensor fusion and fault tolerance.
+
+**Created:** {{CREATION_DATE}}
+**Weevil:** {{WEEVIL_VERSION}}
+**Template:** localization
+
+## What's Included
+
+- **Grid System** - 12x12 field grid (12" cells)
+- **Sensor Fusion** - Combine encoders, IMU, vision
+- **Fault Tolerance** - Graceful sensor failure handling
+- **20+ Tests** - All passing
+
+## Quick Start
+
+```bash
+./gradlew test    # Run tests
+./build.sh        # Build
+./deploy.sh       # Deploy
+```
+
+## Architecture
+
+Field divided into 144 cells (12x12 grid):
+- Cell (0,0) = Red backstage
+- Cell (11,11) = Blue backstage  
+- Cell (6,6) = Center
+
+Sensor fusion priority:
+1. Vision (AprilTags) - ±2" accuracy
+2. IMU + Odometry - ±4" accuracy
+3. Odometry only - ±12" accuracy
+
+## Files
+
+**Localization:**
+- GridCell.java - Cell representation
+- Pose2D.java - Position + heading
+- FieldGrid.java - Coordinate system
+- RobotLocalizer.java - Sensor fusion engine
+
+**Sensors:**
+- OdometryTracker.java - Dead reckoning
+- ImuLocalizer.java - Heading tracking
+- VisionLocalizer.java - AprilTag positioning
+
+**Docs:**
+- LOCALIZATION_GUIDE.md - How it works
+- GRID_SYSTEM.md - Field coordinates
+
+See docs/ for full documentation.