Complete Adafruit BME690 Arduino library implementation

- Add Adafruit_BME690.h/cpp wrapper for Bosch BME69x API
- Include Bosch BME690 SensorAPI files (bme69x.c, bme69x.h, bme69x_defs.h)
- Add example sketch with temperature, pressure, humidity, and gas readings
- Update LICENSE to BSD 3-Clause
- Update README with BME690 library description
- Add .gitignore to exclude docs and config files
- Format code with clang-format per Adafruit standards

Library supports both I2C and SPI communication and provides
simple Arduino-style API for environmental sensing.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: ladyada

.claude/settings.local.json

@@ -2,7 +2,12 @@
   "permissions": {
     "allow": [
       "WebFetch(domain:github.com)",
-      "WebFetch(domain:raw.githubusercontent.com)"
+      "WebFetch(domain:raw.githubusercontent.com)",
+      "Bash(curl:*)",
+      "Bash(arduino-cli compile:*)",
+      "Bash(arduino-cli board:*)",
+      "Bash(arduino-cli lib examples:*)",
+      "Bash(arduino-cli upload:*)"
     ],
     "deny": [],
     "ask": []

.gitignore

@@ -0,0 +1,24 @@
+# Documentation files
+*.pdf
+
+# Output files
+*.txt
+
+# Claude configuration files
+.claude/
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# IDE files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~