Create README.md

Author: ravilushqa

README.md

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+# gpt-pullrequest-updater
+
+### Usage:
+  main [OPTIONS]
+
+### Application Options:
+      --gh-token=     GitHub token [$GITHUB_TOKEN]
+      --openai-token= OpenAI token [$OPENAI_TOKEN]
+      --owner=        GitHub owner [$OWNER]
+      --repo=         GitHub repo [$REPO]
+      --pr-number=    Pull request number [$PR_NUMBER]
+      --test          Test mode [$TEST]
+
+### Help Options:
+  -h, --help          Show this help message