Update documentation.

README.md

@@ -4,14 +4,14 @@
 
 Diffy is a visual regression testing service https://diffy.website. It is primary tailored to testing Drupal and WordPress websites.
 
-This repository is a recepie for DDEV to have a local worker that will allow taking screenshots from local website and upload them to Diffy for further comparisons.
+This repository is a recipe for DDEV to have a local worker that will allow taking screenshots from local website and upload them to Diffy for further comparisons.
 
 ## Installation
 
 Add this addon as `ddev get diffywebsite/ddev-diffy`.
 
-Register an account in Diffy and create an API key. Add the key as API_KEY environmental variable.
+Register an account in Diffy and create an API key. While installation of the addon you will be asked for API KEY and PROJECT ID. Please provide them so configuration is saved.
 
-Create a project in Diffy and save its ID as PROJECT_ID environmental variable.
+To run the screenshots do `ddev screenshot`. It will produce a URL to your screenshots uploaded to Diffy. Next you can compare them to your any other sets (production, staging, baseline etc.).
 
 **Contributed and maintained by [@ygerasimov](https://github.com/ygerasimov)**