Add vscode-languageclient to dependencies

Author: d-torrance

package.json

@@ -83,6 +83,7 @@
 		"@types/vscode": "^1.36.0",
 		"tslint": "^5.12.1",
 		"typescript": "^5.4.0",
+		"vscode-languageclient": "^9.0.1",
 		"vscode-test": "^1.0.0"
 	}
 }