feat(Activity Types): Adds contact and resourceAssignee.

Author: ryasmi

src/statementConstants/activityTypes.ts

@@ -40,6 +40,11 @@ export const book = 'http://id.tincanapi.com/activitytype/book';
  */
 export const comment = 'http://activitystrea.ms/schema/1.0/comment';
 
+/**
+ * Represents an individual or group that may be contacted for information.
+ */
+export const contact = `${customBaseUrl}/contact`;
+
 /**
  * A course represents an entire “content package” worth of material.
  * The largest level of granularity. Unless flat, a course consists of multiple modules
@@ -132,6 +137,11 @@ export const review = 'http://activitystrea.ms/schema/1.0/review';
  */
 export const report = `${customBaseUrl}/report`;
 
+/**
+ * Represents the individual/group that has been assigned to a resource.
+ */
+export const resourceAssignee = `${customBaseUrl}/resource-assignee`;
+
 /**
  * Represents the resource being assigned to an actor.
  */