Optimized documentation of sources

application/symfony/src/Entity/Source/README.md

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+# Source
+Entities are the core component of infinito.
+## Purpose
+The whole domain logic just processes sources. This allows a high layer of abstraction.
+### Functions
+- Heritage values from other sources
+- Connect data of APIS, executable, and static documents
+- High scalability of rights
+- Versioning of every state of a source
+- Process different kinds of types through a identical core of domain logic.
+- Easy to modify and to expand
+
+## UML
+The following UML shows the context of source entities.
+![Entity UML](../.meta/uml.png)
+
+## Types
+### Primitive
+Just contain one MySql native data type.
+### Complex
+Contain out of other sources. E.g. primitives and executables.
+#### Executable
+Process information. They have a seperat class with logic, which is automaticly loaded and processed by the domain logic.
+##### API
+API sources adapt CRUD actions to other services.