SectionList on home screen with API

mobile/src/API.js

@@ -279,6 +279,9 @@ class API extends EventEmitter {
   listWorkItems() {
     return this.get("/workitems")
   }
+  listWorkItemActivities() {
+    return this.get("/workitems/activities")
+  }
   createWorkItem(workItem) {
     return this.post("/workitems", workItem)
   }
@@ -289,6 +292,22 @@ class API extends EventEmitter {
     return this.delete("/workitems/" + _id)
   }
 
+  getActivity(_id) {
+    return this.get("/activities/" + _id)
+  }
+  listActivities() {
+    return this.get("/activities")
+  }
+  createActivity(activity) {
+    return this.post("/activities", activity)
+  }
+  updateActivity(activity) {
+    return this.put("/activities", activity)
+  }
+  deleteActivity(_id) {
+    return this.delete("/activities/" + _id)
+  }
+
   upload(file, progressCallback) {
     return new Promise((resolve, reject) => {
       const chunkSize = 32 * 1024