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+## Usage
+
+### 1. Register your APP
+Register your APP on irext SDK console [irext SDK console](http://irext.net), (You need to register an irext account first
+
+While your APP is registered, you can see the APP key and APP secret in your APP list
+
+### 2. Import the SDK
+You can either import this project or download the web-api .jar file from [Java SDK](http://irext-lib-releaese.oss-cn-hangzhou.aliyuncs.com/decode/0.1.2/web-api-java-0.1.2.jar) and import to your project
+
+### 3. Use the SDK
+
+Import classes:
+```java
+import net.irext.webapi.model.*;    
+import net.irext.webapi.WebAPIs;
+```
+Get web API instance:
+```java
+WebAPIs webApis = WebAPIs.getInstance();
+```
+Sign in for access id and token:
+```java
+// App key and secret are fetched in step 1.
+UserApp userApp = webApis.signIn(appKey, appSecret);
+int id = userApp.getId();
+int token = userApp.getToken();
+```
+Fetch household appliances categories:
+```java
+List<Category> categories = webApis.listCategories();
+```
+Fetch brands of a certain category other than STB:
+```java
+List<Brand> brands = webApis.listBrands(category.getId());
+```
+Fetch cities (in China) for STB:
+```java
+List<City> provinces = webApis.listProvinces();
+List<City> cities = webApis.listCities(provincePrefix);
+```
+Fetch STB operators of a certain city:
+```java
+List<StbOperator>; operators = webApis.listOperators(cityCode);
+```
+Fetch remote indexes of a certain brand or STB operator:
+```java
+List<RemoteIndex> remoteIndexes = webApis.listRemoteIndexes(category.getId(), brand.getId(), city.getCode(), operator.getOperator_id());
+```
+Download IR binary for certain remote index:
+```java
+InputStream is = webApis.downloadBin(remoteIndex.getRemote_map(), remoteIndex.getId());
+```