Update README.md to include TagsApi example (#564)

README.md

@@ -305,6 +305,7 @@ The following is a list of the available sub APIs along with a sample use of eac
 &nbsp;&nbsp;[SessionApi](#sessionapi)<br/>
 &nbsp;&nbsp;[SnippetsApi](#snippetsapi)<br/>
 &nbsp;&nbsp;[SystemHooksApi](#systemhooksapi)<br/>
+&nbsp;&nbsp;[TagsApi](#tagsapi)<br/>
 &nbsp;&nbsp;[TodosApi](#todosapi)<br/>
 &nbsp;&nbsp;[UserApi](#userapi)<br/>
 &nbsp;&nbsp;[WikisApi](#wikisapi)
@@ -571,6 +572,12 @@ List<Snippet> snippets = gitLabApi.getSnippetsApi().getSnippets();
 List<SystemHook> hooks = gitLabApi.getSystemHooksApi().getSystemHooks();
 ```
 
+#### TagsApi
+```java
+// Get a list of tags for the specified project ID
+List<Tag> tags = gitLabApi.getTagsApi().getTags(projectId);
+```
+
 #### TodosApi
 ```java
 // Get a list of all pending todos for the current user