Integration and add heat map demo

- Implemented OpenStreetMap using WebView with Leaflet.js
- Added OpenStreetMapView component with interactive map functionality
- Created heat map visualization with color-coded intensity
- Added 30 dummy location points around San Francisco Bay Area
- Implemented location tracking with real-time pin placement
- Added comprehensive UI with two-row button layout
- Features: Start/Stop tracking, Center map, Demo heat map, Clear demo, Reset map
- Added location count display and confirmation dialogs
- Updated project structure and documentation
- All functionality tested and working on Android emulator

LocationTrackerApp/set-api-key.ps1

@@ -0,0 +1,19 @@
+# PowerShell script to set Google Maps API key environment variable
+# Usage: .\set-api-key.ps1 -ApiKey "your_actual_api_key_here"
+
+param(
+    [Parameter(Mandatory=$true)]
+    [string]$ApiKey
+)
+
+# Set the environment variable for the current session
+$env:GoogleMapsApiKey = $ApiKey
+
+# Also set it for the current PowerShell session
+[Environment]::SetEnvironmentVariable("GoogleMapsApiKey", $ApiKey, "Process")
+
+Write-Host "Google Maps API Key set to: $ApiKey" -ForegroundColor Green
+Write-Host "You can now build the app with: dotnet build -f net9.0-android" -ForegroundColor Yellow
+Write-Host ""
+Write-Host "Note: This environment variable is only set for the current session." -ForegroundColor Cyan
+Write-Host "To make it permanent, add it to your system environment variables." -ForegroundColor Cyan