Merge branch 'master' of https://github.com/lua/lua

Adding file README.md to local repository.

README.md

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+# Lua
+
+This is the repository of Lua development code, as seen by the Lua team. It contains the full history of all commits but is mirrored irregularly. For complete information about Lua, visit [Lua.org](https://www.lua.org/).
+
+Please **do not** send pull requests. To report issues and send patches, post a message to the [Lua mailing list](https://www.lua.org/lua-l.html).
+
+Download official Lua releases from [Lua.org](https://www.lua.org/download.html).