-changed README

-license changed to BSD (maybe temporary)
-added configurations to dub.json
-initial ECS implementation (WIP):
	-Manager, System, Entity, Component
	-registering components
	-registering systems
	-calling update

source/ecs/system.d

@@ -0,0 +1,16 @@
+module ecs.system;
+
+import ecs.entity;
+import ecs.manager;
+
+struct System
+{
+    ///should system update and catch events?
+    bool enabled = true;
+    ///system priority
+    int prority;
+    ///pointer to system implementation
+    void* system_pointer;
+
+    void function(ref EntityManager.CallData data, void* entity) update;
+}