Add docs for the new Kuler Sky integration (#15410)

Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io>

source/_integrations/kulersky.markdown

@@ -0,0 +1,46 @@
+---
+title: Kuler Sky
+description: Instructions for integrating Brightech Kuler Sky Bluetooth floor lamps with Home Assistant.
+ha_category:
+  - Light
+ha_iot_class: Local Polling
+ha_release: '1.0.0'
+ha_domain: kulersky
+ha_codeowners:
+  - '@emlove'
+ha_config_flow: true
+---
+
+This integration connects Brightech Kuler Sky floor lamps to Home Assistant.
+
+## Configuration
+
+This integration can be configured using the integrations page in Home Assistant.
+
+Menu: **Configuration** -> **Integrations**.
+
+Click on the `+` sign to add an integration and search for **Kuler Sky**.
+
+The integration will scan for nearby Bluetooth devices, and ask you to select your lamp.
+
+## Additional information for Home Assistant Core on Python environments
+
+This integration requires `pybluez` to be installed. On Debian based installs, run:
+
+```bash
+sudo apt install bluetooth
+```
+
+Before you get started with this integration, please note that:
+
+- Requires access to the Bluetooth stack, see [Rootless Setup section](#rootless-setup) for further information
+
+## Rootless Setup
+
+Normally accessing the Bluetooth stack is reserved for `root`, but running programs that are networked as `root` is a bad security wise. To allow non-root access to the Bluetooth stack we can give Python 3 and `hcitool` the missing capabilities to access the Bluetooth stack. Quite like setting the setuid bit (see [Stack Exchange](https://unix.stackexchange.com/questions/96106/bluetooth-le-scan-as-non-root) for more information).
+
+```bash
+sudo apt-get install libcap2-bin
+sudo setcap 'cap_net_raw,cap_net_admin+eip' `readlink -f \`which python3\``
+sudo setcap 'cap_net_raw+ep' `readlink -f \`which hcitool\``
+```