Update readme

Author: SuperSandro2000

README.md

@@ -1,9 +1,21 @@
 # Factorio watchdog for release changes
 
+Build trigger for factorio on new releases
+
 ## Enviroment variables
 
-- **GIT_EMAIL**: Email used for creating the commit
-- **GIT_NAME**: Name used for creating the commit
-- **GITHUB_USER**: Github username used for api calls and git pull&push
-- **GITHUB_TOKEN**: Github private token used for api calls and git pull&push
-- **DISCORD_WEBHOOK_URL**: Discord webhook url for announcements
+Factorio Docker Watchdog must be configured via environment variables.
+Below you find a list with all required and optional variables.
+
+### Required
+
+- **GIT_EMAIL**: Email used by git for committing
+- **GIT_NAME**: Username used by git for committing
+- **GITHUB_USER**: GitHub Username used for api calls, git pull and push
+- **GITHUB_TOKEN**: GitHub token used for api calls, git pull and push
+- **GITHUB_REPO_OWNER**: GitHub Username/Organization where to push to
+- **GITHUB_REPO_NAME**: GitHub Repository where to push to
+
+### Optional
+
+- **DISCORD_WEBHOOK_URL**: Discord webhook url for announcements