添加msecnd.net的支持 (#82)

* 添加appsettings.msecnd.json;替换vscode的cdn源

FastGithub/appsettings/appsettings.msecnd.json

@@ -0,0 +1,14 @@
+{
+  "FastGithub": {
+    "DomainConfigs": {
+      "az764295.vo.msecnd.net": {
+        "TlsSni": true,
+        "TlsIgnoreNameMismatch": true,
+        "Destination": "https://vscode.cdn.azure.cn/"
+      },
+      "*.*.msecnd.net": {
+        "TlsIgnoreNameMismatch": true
+      }
+    }
+  }
+}