Initial community commit

Src/external_dependencies/openmpt-trunk/include/premake/website/docs/table.indexof.md

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+Returns the key or index of a value within a table.
+
+```lua
+table.indexof(arr, value)
+```
+
+### Parameters ###
+
+`arr` is a table containing indexed elements. `value` is the value for which to search.
+
+
+### Return Value ###
+
+The key or index of the value if it is present in the table; nil otherwise.
+
+
+### Availability ###
+
+Premake 5.0 or later.