Add initial KNX configuration files and .gitignore

- Created .gitignore to exclude specific directories and files.
- Added climate.yaml for climate control configurations.
- Added cover.yaml for cover control configurations.
- Created knx_groups.csv and knx_groups_not_added.csv for KNX group management.
- Included knx.yaml to organize KNX components and their configurations.
- Added light.yaml for light control configurations.

.gitignore

@@ -0,0 +1,8 @@
+.cloud/
+.storage/
+blueprints/
+custom_components/
+deps/
+tts/
+.HA_VERSION
+home-assistant*