Updated test cases documentation

docs/test_cases/t30005.md

@@ -0,0 +1,53 @@
+# t30005 - Package namespace alias test case
+## Config
+```yaml
+compilation_database_dir: ..
+output_directory: puml
+diagrams:
+  t30005_package:
+    type: package
+    glob:
+      - ../../tests/t30005/t30005.cc
+    include:
+      namespaces:
+        - clanguml::t30005
+    using_namespace:
+      - clanguml::t30005
+    plantuml:
+      before:
+        - "' t30005 test package diagram"
+```
+## Source code
+File t30005.cc
+```cpp
+namespace clanguml {
+namespace t30005 {
+
+namespace A::AA::AAA {
+struct C1 {
+};
+}
+
+namespace B::BB::BBB {
+namespace A6 = A::AA::AAA;
+namespace ASix = A6;
+struct C2 {
+    ASix::C1 *cb;
+};
+}
+
+namespace C::CC::CCC {
+namespace A6 = A::AA::AAA;
+namespace ASix = A6;
+using ADSix = ASix::C1;
+struct C2 {
+    ADSix *cc;
+};
+}
+}
+
+}
+
+```
+## Generated UML diagrams
+![t30005_package](./t30005_package.png "Package namespace alias test case")