Update README.md

Author: x7c1

README.md

@@ -12,7 +12,7 @@ Studyplus SDK for Android
 
 Graddle Project
 
-```
+```groovy
 repositories {
     maven { url 'http://raw.github.com/studyplus/Studyplus-Android-SDK/master/repository' }
 }
@@ -21,10 +21,47 @@ dependencies {
 }
 ```
 
-##Usage
+## Usage
+
+### Authenticate
+
+Open an Activity to connect with Studyplus.
+
+```java
+AuthTransit.from(activity).startActivity(
+	context.getString("app_consumer_key"),
+	context.getString("app_consumer_key_secret")
+);
+```
+
+Then save its result.
+
+```java
+@Override
+protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+	CertificationStore.create(context).update(data);
+}
+```
+
+### Post a record to Studyplus
+
+Create ApiRequest and send it with ApiClient.
+
+```java
+ApiRequest request = StudyRecordPostRequest.of(
+	new StudyRecordBuilder()
+		.setComment("perfect!")
+		.setAmountTotal(30)
+		.setDurationSeconds(2 * 60)
+		.build()
+);
+StudyplusApi.getClient(context).send(request);
+```
+
+### More
 
-Coming Soon
+* See also [actual examples](https://github.com/studyplus/Studyplus-Android-SDK/blob/master/SDKExample/src/main/java/jp/studyplus/android/sdk/example/ExampleActivity.java).
 
-##License
+## License
 
 * [MIT License](http://opensource.org/licenses/MIT)