Add Javascript at README.md (#10476)

diff --git a/README.md b/README.md
index ad2b4d3..3377f3a 100644
--- a/README.md
+++ b/README.md
@@ -62,6 +62,7 @@
 | Go                                   | [protocolbuffers/protobuf-go](https://github.com/protocolbuffers/protobuf-go)|
 | PHP                                  | [php](php)                                                  |
 | Dart                                 | [dart-lang/protobuf](https://github.com/dart-lang/protobuf) |
+| Javascript                           | [protocolbuffers/protobuf-javascript](https://github.com/protocolbuffers/protobuf-javascript)|
 
 Quick Start
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