Point visitors to monorepo. Closes #236, #224, #222, #214, #213, #208, …

…#207, #198, #197, #196, #195, #166, #137, #130, #129, #123, #109, #73, #60, #59, #56, #54, #52, #41, #31, #256, #254, #229, #210, #179, #163, #111, #37

README.md

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+# Gherkin
+
+The Gherkin project has moved to the [cucumber/cucumber](https://github.com/cucumber/cucumber/tree/master/gherkin)
+monorepo.
+
+All issues and pull requests have been closed.
+
+New issues should be created in the [cucumber/cucumber issue tracker](https://github.com/cucumber/cucumber/issues). Issues that replace closed
+issues in this repo can link to the old issues for context.