readme update

README.md

@@ -10,4 +10,20 @@ $ mvn appengine:devserver
 for a local development server instance.
 
 ## Intellij 啟動與偵錯
-https://cloud.google.com/code/docs/intellij/deploy-local
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+https://cloud.google.com/code/docs/intellij/deploy-local
+
+## 各流程呼叫API順序
+```
+- 註冊
+    1. BeginMakeCredential
+    2. FinishMakeCredential
+    3. RegisteredKeys
+
+- 移除Credential
+    1. RemoveCredential
+    2. RegisteredKeys
+
+- 登入
+    1. BeginGetAssertion
+    2. FinishGetAssertion
+```
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