Add README.md

Author: jez

README.md

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+# sorbet.run
+
+This is the repo that hosts https://sorbet.run. We commit and push the Sorbet
+WASM payload to this repo on each master build of
+https://github.com/sorbet/sorbet.
+
+Basically the entire site is in `docs/`.
+
+If you are at all interested in making sorbet.run better, please contribute!
+We're happy to chat about potential improvements in the #internals on Slack (see
+https://sorbet.org/en/community).