Added test case documentation generator

docs/test_cases/t90000.md

@@ -0,0 +1,31 @@
+# t90000 - Basic config test
+## Config
+```yaml
+compilation_database_dir: ..
+output_directory: puml
+diagrams:
+  t90000_class:
+    type: class
+    plantuml:
+      before:
+        - 'class "Foo" as C_001'
+        - 'class C_001 {'
+        - ' +int value'
+        - '}'
+        - 'C_001 <|-- ArrayList'
+        - 'note top of C_001: This is a very important class.'
+        - 'note "This is a\nfloating note" as N1'
+        - 'note "This note is connected\nto several objects." as N2'
+        - 'C_001 .. N2'
+        - 'N2 .. ArrayList'
+        - 'class "Boo" as C_002'
+        - 'class C_002 {'
+        - '}'
+
+```
+## Source code
+```cpp
+
+```
+## Generated UML diagrams
+![t90000_class](./t90000_class.png "Basic config test")