docs: 添加 API docs

api/authentication/folder.bru

@@ -0,0 +1,7 @@
+meta {
+  name: Authentication
+}
+
+auth {
+  mode: none
+}

api/authentication/login.bru

@@ -0,0 +1,23 @@
+meta {
+  name: Login
+  type: http
+  seq: 1
+}
+
+post {
+  url: {{BaseURL}}/auth/login
+  body: json
+  auth: inherit
+}
+
+body:json {
+  {
+    "username": "helix",
+    "password": "123456"
+  }
+}
+
+settings {
+  encodeUrl: true
+  timeout: 0
+}