add gitter

Author: sheche@microsoft.com

README.md

@@ -1,6 +1,7 @@
 # LeetCode
 [![Travis CI](https://travis-ci.org/jdneo/vscode-leetcode.svg?branch=master)](https://travis-ci.org/jdneo/vscode-leetcode)
 [![Marketplace Version](https://vsmarketplacebadge.apphb.com/version-short/shengchen.vscode-leetcode.svg)](https://vsmarketplacebadge.apphb.com/version-short/shengchen.vscode-leetcode.svg)
+[![Gitter](https://badges.gitter.im/vscode-leetcode/Lobby.svg)](https://gitter.im/vscode-leetcode/Lobby)
 
 Solve LeetCode problems in VS Code.
 - [中文](#中文)

package.json

@@ -142,13 +142,13 @@
                             "swift"
                         ],
                         "scope": "window",
-                        "description": "Default language preference for solving the problems."
+                        "description": "Default language for solving the problems."
                     },
                     "leetcode.showSetDefaultLanguageHint": {
                         "type": "boolean",
                         "default": true,
                         "scope": "window",
-                        "description": "Show a hint to let user set the default language preference."
+                        "description": "Show a hint to set the default language."
                     }
                 }
             }