[MERGE #5868 @open-source-explorer] Add PR welcoming badge
[MERGE #5868 @open-source-explorer] Add PR welcoming badge

Merge pull request #5868 from open-source-explorer:patch-1

Closes #5846

Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore