Added framework xml documentation for all "exploration" events.

ObservatoryFramework/Files/Journal/Exploration/MaterialCollected.cs

@@ -1,10 +1,25 @@
 namespace Observatory.Framework.Files.Journal
 {
+    /// <summary>
+    /// Event generated when a material resource is collected.
+    /// </summary>
     public class MaterialCollected : JournalBase
     {
+        /// <summary>
+        /// Category to which the material belongs.
+        /// </summary>
         public string Category { get; init; }
+        /// <summary>
+        /// Name of the material.
+        /// </summary>
         public string Name { get; init; }
+        /// <summary>
+        /// Localised name of the material.
+        /// </summary>
         public string Name_Localised { get; init; }
+        /// <summary>
+        /// Count of the material.
+        /// </summary>
         public int Count { get; init; }
     }
 }