first chunk tree impl

develop/example.lua

@@ -1 +1,14 @@
 local evolved = require 'evolved'
+
+local registry = evolved.registry()
+
+local fragments = {
+    position = registry:entity(),
+    velocity = registry:entity(),
+}
+
+do
+    local entity = registry:entity()
+    entity:insert(fragments.position)
+    entity:insert(fragments.velocity)
+end