-update README code example (to one that compile)

-remove Entity.instance and gEM, global manager is now gEntityManager

README.md

@@ -101,6 +101,11 @@ Online demo support multithreading and page tries to check if client support WAS
 
 ```d
 
+import bubel.ecs.core;
+import bubel.ecs.manager;
+import bubel.ecs.attributes;
+import std.array : staticArray;
+
 struct Position
 {
     float x;
@@ -122,7 +127,7 @@ struct UpdateSystem
 {
     mixin ECS.System; //makes struct system
 
-    ECS.ExcludedComponents!(StaticFlag); //prevents static entities from update
+    mixin ECS.ExcludedComponents!(StaticFlag); //prevents static entities from update
 
     struct EntitiesData
     {
@@ -136,26 +141,31 @@ struct UpdateSystem
     {
         foreach(i; 0..data.length) //iterate over entities
         {
-            data.positions[i].x += data.velocities[i].x * dt;
-            data.positions[i].y += data.velocities[i].y * dt;
+            data.positions[i].x += data.velocities[i].x;
+            data.positions[i].y += data.velocities[i].y;
         }
     }
 }
 
 void main()
 {
-    manager.beginRegister();
+	//initialize ECS
+	EntityManager.initialize();
+
+	//begin registering process
+    gEntityManager.beginRegister();
     //register components
-    manager.registerComponent!Position;
-    manager.registerComponent!Velocity;
-    manager.registerComponent!StaticFlag;
+    gEntityManager.registerComponent!Position;
+    gEntityManager.registerComponent!Velocity;
+    gEntityManager.registerComponent!StaticFlag;
     //register system with priority 0
-    manager.registerSystem!UpdateSystem(0);
-    manager.endRegister();
+    gEntityManager.registerSystem!UpdateSystem(0);
+	//end registering process
+    gEntityManager.endRegister();
 
     //allocate template
-    EntityTemplate* tmpl = manager.allocateEmplate([becsID!Velocity, becsID!Position].staticArray);
-    scope (exit) manager.freeTemplate(tmpl);
+    EntityTemplate* tmpl = gEntityManager.allocateTemplate([becsID!Velocity, becsID!Position].staticArray);
+    scope (exit) gEntityManager.freeTemplate(tmpl);
 
     //gets pointer to template component data
     Position* position = tmpl.getComponent!Position;
@@ -163,12 +173,15 @@ void main()
     {
         position.x = i % 10;
         position.y = i / 10;
-        manager.addEntity(tmpl);
+        gEntityManager.addEntity(tmpl);
     }
 
-    manager.begin(); //start frame, inside system onBegin callbacks are called
-    manager.update(); //update all systems, there onUpdate callbacks are called
-    manager.end(); //end frame, inside system onEnd callbacks are called
+    gEntityManager.begin(); //start frame, inside system onBegin callbacks are called
+    gEntityManager.update(); //update all systems, there onUpdate callbacks are called
+    gEntityManager.end(); //end frame, inside system onEnd callbacks are called*/
+
+	//free ECS data
+	EntityManager.destroy();
 }
 
 ```