Added activity type help block

src/Plugin/Block/ActivityTypeHelp.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Drupal\opencase\Plugin\Block;
+
+use Drupal\Core\Block\BlockBase;
+
+/**
+ * Provides a Block with some help text about actor type fields
+ *
+ * @Block(
+ *   id = "activity_type_help",
+ *   admin_label = @Translation("Activity Type Help"),
+ *   category = @Translation("Help"),
+ * )
+ */
+class ActivityTypeHelp extends BlockBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function build() {
+    return array(
+      '#markup' => "
+        <h3>All activity types have default fields such as description and time taken. Other fields can be added and managed here.</h3>
+
+      "
+    );
+  }
+
+}