Updated the readme file

README.md

@@ -1,4 +1,23 @@
 # Figma to ESPHome display code generator
 Generates YML and C++ code for an ESPHome display from a Figma document
 
-## [https://notisrac.github.io/FigmaToESPHome/](https://notisrac.github.io/FigmaToESPHome/)
+## Use it here: [https://notisrac.github.io/FigmaToESPHome/](https://notisrac.github.io/FigmaToESPHome/)
+
+## How to use
+Fill in the form with the appropriate data and click the ```Generate``` button
+
+### Figma Api URL
+URL of the Figma API - you can leave this as is
+
+### Figma Api Token
+Your security token for the Figma Api - find more info on how to generate one, [here](https://www.figma.com/developers/api#access-tokens)
+
+### Figma file key
+The unique identifier of your Figma file:
+![Wher to find the file key](./docs/figma_file_key.png)
+
+### Page name
+Name of the page, the design is on. E.g: ```Page 1```
+
+### Frame name
+The frame that contains the design. E.g: ```Frame 1``` or ```My awesome design```