improve readme

- e.g. mention some important classes

Author: chrisrueger

ui/org.eclipse.pde.bnd.ui/README.MD

@@ -26,7 +26,7 @@ transform an (Eclipse) `IProject` into a (bndlib) `Project` (from were the Works
 ```
 @Component
 @AdapterTypes(adaptableClass = IProject.class, adapterNames = Project.class)
-public class BndPluginAdapter implements IAdapterFactory {
+public class MyBndPluginAdapter implements IAdapterFactory {
 
   @Override
   public <T> T getAdapter(Object adaptableObject, Class<T> adapterType) {
@@ -46,6 +46,16 @@ public class BndPluginAdapter implements IAdapterFactory {
 }
 ```
 
+Some relevant 'glue' classes for Bnd <-> PDE interaction, to have a look at:
+
+- `org.eclipse.pde.bnd.ui.Central`
+- `org.eclipse.pde.bnd.ui.Workspaces`
+- `org.eclipse.pde.internal.core.bnd.PdeBndAdapter`
+- `org.eclipse.pde.internal.core.bnd.BndProjectManager`
+- `org.eclipse.pde.bnd.ui.RepositoryUtils`
+- `org.eclipse.pde.internal.core.bnd.BndWorkspaceServiceFactory` (gets registered as an OSGi Service)
+
+
 ## Available components
 
 Beside some integration stuff (e.g. enable to [discover bndlib plugins](https://github.com/eclipse-pde/eclipse.pde/blob/master/ui/org.eclipse.pde.bnd.ui/src/org/eclipse/pde/bnd/ui/internal/Auxiliary.java) inside an OSGi runtime)