Antag Datums. Oh also minds. (#100)

AKA: Minds and there's a stupid basic roles framework.

Content.Server/Mobs/Role.cs

@@ -0,0 +1,36 @@
+// Hey look,
+// Antag Datums.
+
+namespace Content.Server.Mobs
+{
+    /// <summary>
+    ///     The Role is a basic building block for,
+    ///     well, IC roles.
+    ///     This can be anything and is not necessarily limited to antagonists.
+    /// </summary>
+    public abstract class Role
+    {
+        /// <summary>
+        ///     The mind owning this role instance.
+        /// </summary>
+        public Mind Mind { get; }
+
+        /// <summary>
+        ///     A friendly name for this role type.
+        /// </summary>
+        public abstract string Name { get; }
+
+        protected Role(Mind mind)
+        {
+            Mind = mind;
+        }
+
+        /// <summary>
+        ///     Called when a mind (player) first gets this role, to greet them.
+        /// </summary>
+        public virtual void Greet()
+        {
+
+        }
+    }
+}