workflow readme

Author: Alessandro100

.github/workflows/README.md

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+## Vercel Deployments
+
+### Feature PR to main [vercel-preview-pr.yml](./web-app-deployer.yml)
+- Runs checks: lint, test, e2e:test
+- Creates a preview URL to test feature using the DEV environment
+- Generate Lighthouse report based on preview URL
+
+### When feature is merged to main 
+- Vercel automatically deploys any new changes done in main to the staging environment
+- No github workflow
+
+### Production Release [verecl-prod-on-release.yml](./verecl-prod-on-release.yml)
+- Done automatically on Github releases 
+- Can be manually triggered