Add support for app defined services

app/bundle/daton_units.ts

@@ -7,3 +7,4 @@ export { default as HttpKernelUnit } from '../../lib/src/unit/HttpKernel.ts'
 export { default as ModelsUnit } from '../../orm/src/ModelsUnit.ts'
 export { default as HttpServerUnit } from '../../lib/src/unit/HttpServer.ts'
 export { default as RoutingUnit } from '../../lib/src/unit/Routing.ts'
+export { default as ServicesUnit } from '../../lib/src/unit/Services.ts'

app/units.ts

@@ -7,10 +7,12 @@ import {
     HttpKernelUnit,
     ModelsUnit,
     HttpServerUnit,
-    RoutingUnit
+    RoutingUnit,
+    ServicesUnit,
 } from './bundle/daton_units.ts'
 
 export default [
+    ServicesUnit,
     ConfigUnit,
     DatabaseUnit,
     ModelsUnit,