feat: copilot language server in server list (#2107)

Author: MuntasirSZN

_implementors/servers.md

@@ -300,4 +300,5 @@ index: 1
 | * | [daquexian](https://github.com/daquexian) | [tagls](https://github.com/daquexian/tagls) | Python |
 | * | [Sonar](https://github.com/SonarSource) | [SonarLint Language Server](https://github.com/SonarSource/sonarlint-language-server) | Java |
 | * | [kbwo](https://github.com/kbwo) | [testing-language-server](https://github.com/kbwo/testing-language-server) | Rust |
+| * | [GitHub](https://github.com/github/copilot-language-server-release) | [@github/copilot-language-server](https://www.npmjs.com/package/@github/copilot-language-server) (no code repository available, issues and feature requests can be done) | JavaScript |
 {: .table .table-bordered .table-responsive}