add glossary

README.md

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 <big>**&#9888;**</big>
 Just don't forget switching to the migration mode, once there is a production database!
+
+## Further Documentation
+
+- the `doc` directory contains architecture concepts and a glossary
+- TODO.md tracks requirements and progress for the contract of the initial project,
+  please do not amend anything in this document

doc/glossary.md

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+### hsadminNg Glossary
+
+This is a collection of terms used in this project, which either might not be generally known or unclear in meaning.
+If you miss something, please add it with a `TODO` marker.
+
+#### Blackbox-Test
+
+A blackbox-test does not know and not consider such internals of an implementation, it just tests externally observable behaviour.
+
+
+#### Business Object
+
+Used in the RBAC-system to refer to an object from the business realm.
+The usual term is *domain object* but in our context, the term *domain* could be too easily confused with a DNS *Internet domain*.  
+
+
+#### Dummy
+
+A *dummy* is a kind of *Test-Double* which replaces a real dependency which is not really needed in the test case.
+
+
+#### Fake
+
+A *fake* is a kind of *Test-Double*  without using any library, but rather a manual fake implementation of a dependency.
+
+
+#### Mock
+
+A *mock* is a kind of *Test-Double* which can be configured to behaviours as needed by a test-case.
+
+Often the term "mock" is used in a generic way, because typical mocking libraries like *Mockito* can also be used as dummies or spies and can replace fakes.
+
+
+#### RBAC
+
+Abbreviation for *Role Based Access Control*.
+A system to control access to business objects by defining users, roles, and permissions.
+See also [The INCITS 359-2012 Standard](https://www.techstreet.com/standards/incits-359-2012?product_id=1837530).
+
+In our case we are implementing a hierarchical RBAC for a hierarchical and dynamic business object structure.
+More information can be found in our [RBAC Architecture Document](rbac.md).
+
+
+#### Tenant
+
+*Tenant* is one of the standard roles of Hostsharing's RBAC system.
+It is assigned as a sub-role to those who have rights on sub-objects of a business object.
+Usually, tenants can only view the contents.
+
+Generally, tenant roles only apply for the mere existence, id and name of a business object,
+not for internal details.
+E.g. a tenant of a customer could be the administrator of a hosting package of that customer.
+They can view some identifying information of that customer, but not view their billing and banking information.
+
+
+#### Whitebox-Test
+
+A whitebox-test knows and considers the internals of an implementation, e.g. it knows which dependencies it needs and can test special, implementation-dependent cases.
+
+
+#### Test-Double
+
+A "double" is a general term for something which replaces a real implementation of a dependency of the unit under test.
+This can be a "dummy", a "fake", a "mock", a "spy" or a "stub".