Add btn info

Author: dark-flames

src/components/toolbar-button/btn-info.js

@@ -0,0 +1,10 @@
+export default {
+    name: 'info',
+    icon: 'fa-info-circle',
+    title: '关于',
+    action: {
+        insert: function () {
+            window.location.href="https://github.com/luogu-dev/markdown-palettes";
+        }
+    }
+}

src/components/toolbar-button/toolbarBtn.js

@@ -12,6 +12,7 @@ import BtnHr from './btn-hr'
 import BtnCode from './btn-code'
 import BtnHide from './btn-hide'
 import BtnFullscreen from './btn-fullscreen'
+import BtnInfo from './btn-info'
 
 export const defaultBtns = [
     BtnBold,
@@ -35,7 +36,9 @@ export const defaultBtns = [
     BtnTable,
     Divider,
     BtnHide,
-    BtnFullscreen
+    BtnFullscreen,
+    Divider,
+    BtnInfo
 ]
 
 function getDefaultBtnsMap () {