[docs] Add Getting started guide

SUMMARY.md

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 * [Home](README.md)
+* [Getting started](docs/getting-started.md)
 * [💻 Boards & CPU list](docs/supported.md)
 * [✔️ Implementation status](docs/implementation-status.md)
 * [🔧 Configuration](docs/config.md)

docs/getting-started.md

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+# Getting started
+
+Using LibreTuya is simple, just like every other PlatformIO development platform.
+
+## For your own projects
+
+If you're developing your own embedded software, and want it to run on LibreTuya-supported chips, the installation is simple:
+
+1. [Install PlatformIO](https://platformio.org/platformio-ide)
+2. `platformio platform install https://github.com/kuba2k2/libretuya`
+3. Create a project, build it and upload to the chip
+
+## Community projects
+
+LibreTuya was developed with popular community projects in mind. Currently, unofficial ESPHome port is available (the PR will hopefully be merged into upstream at some point).
+
+### ESPHome
+
+Because ESPHome does not natively support running on non-ESP chips, you need to use a fork of the project.
+
+Assuming you have PlatformIO, git and Python installed:
+
+1. Open a terminal/cmd.exe, create `esphome` directory and `cd` into it.
+2. `git clone https://github.com/kuba2k2/libretuya-esphome -b platform/libretuya` (you need the `platform/libretuya` branch)
+3. Go to [Boards & CPU list](https://kuba2k2.github.io/libretuya/docs/supported/) and choose your board name.
+4. Create a YAML config file for your device. You can either:
+	- use `python -m esphome wizard yourdevice.yml` - type answers to the six questions the wizard asks
+	- if your board isn't available in the wizard yet, use the manual YAML method below
+	- write a config file manually:
+		```yaml
+		esphome:
+		  name: yourdevice
+
+		libretuya:
+		  board: wr3
+
+		logger:
+		api:
+		  password: ""
+		ota:
+		  password: ""
+
+		wifi:
+		  ssid: "YourWiFiSSID"
+		  password: "SecretPa$$w0rd"
+		  ap:
+		    ssid: "Yourdevice Fallback Hotspot"
+		    password: "Dv2hZMGZRUvy"
+		```
+5. Install LibreTuya: `platformio platform install https://github.com/kuba2k2/libretuya`. This step is necessary, as otherwise ESPHome will try to use a version from the registry, which is often outdated.
+6. Edit the config file to use your installed LT version:
+	```yaml
+	libretuya:
+	  board: wr3
+	  framework:
+	    version: latest
+	```
+7. `python -m esphome compile yourdevice.yml`
+8. The binary file, ready for uploading, is now in `.esphome/build/yourdevice/.pioenvs/yourdevice/`. Refer to your board README to find appropriate flashing instructions.