docs: 初始化项目，添加commitizen和git cz

- 新建README.md

.gitignore

+.DS_Store
+node_modules
+/dist
+
+# local env files
+.env.local
+.env.*.local
+
+# Log files
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Editor directories and files
+.idea
+.vscode
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
\ No newline at end of file

package.json

+{
+  "name": "demo",
+  "version": "0.0.0",
+  "private": true,
+  "scripts": {
+    "start": "node ./bin/www"
+  },
+  "dependencies": {
+    "body-parser": "~1.17.1",
+    "cookie-parser": "~1.4.3",
+    "debug": "~2.6.3",
+    "express": "~4.15.2",
+    "jade": "~1.11.0",
+    "morgan": "~1.8.1",
+    "serve-favicon": "~2.4.2"
+  },
+  "devDependencies": {
+    "cz-conventional-changelog": "^3.0.2"
+  },
+  "config": {
+    "commitizen": {
+      "path": "./node_modules/cz-conventional-changelog"
+    }
+  }
+}