Updated test cases documentation

docs/test_cases/t30003.md

@@ -0,0 +1,57 @@
+# t30003 - Package deprecated attribute test case
+## Config
+```yaml
+compilation_database_dir: ..
+output_directory: puml
+diagrams:
+  t30003_package:
+    type: package
+    glob:
+      - ../../tests/t30003/t30003.cc
+    include:
+      namespaces:
+        - clanguml::t30003
+    using_namespace:
+      - clanguml::t30003
+    plantuml:
+      before:
+        - "' t30003 test package diagram"
+```
+## Source code
+File t30003.cc
+```cpp
+namespace clanguml {
+namespace t30003 {
+
+namespace ns1 {
+namespace ns2_v1_0_0 {
+class A {
+};
+}
+
+namespace [[deprecated]] ns2_v0_9_0 {
+class A {
+};
+}
+
+namespace {
+class Anon final {
+};
+}
+}
+
+namespace [[deprecated]] ns3 {
+
+namespace ns1::ns2 {
+class Anon : public t30003::ns1::ns2_v1_0_0::A {
+};
+}
+
+class B : public ns1::ns2::Anon {
+};
+}
+}
+}
+```
+## Generated UML diagrams
+![t30003_package](./t30003_package.png "Package deprecated attribute test case")