Updated test cases documentation

docs/test_cases/t00040.md

@@ -0,0 +1,68 @@
+# t00040 - Relationship and access filter test
+## Config
+```yaml
+compilation_database_dir: ..
+output_directory: puml
+diagrams:
+  t00040_class:
+    type: class
+    generate_packages: false
+    glob:
+      - ../../tests/t00040/t00040.cc
+    using_namespace:
+      - clanguml::t00040
+    include:
+      namespaces:
+        - clanguml::t00040
+      access:
+        - public
+        - protected
+    exclude:
+      relationships:
+        - dependency
+      elements:
+        - clanguml::t00040::B
+```
+## Source code
+File t00040.cc
+```cpp
+namespace clanguml::t00040 {
+
+struct B {
+};
+
+struct A {
+public:
+    int get_a() { return hidden_a_; }
+
+protected:
+    int ii_;
+
+private:
+    void foo() { }
+
+    int hidden_a_;
+};
+
+class AA : public A {
+public:
+};
+
+class AAA : public AA {
+public:
+    int get_aaa() { return hidden_aaa_; }
+    B *b;
+
+private:
+    int hidden_aaa_;
+};
+
+struct R {
+    void foo(A *a) { }
+};
+
+} // namespace clanguml::t00040
+
+```
+## Generated UML diagrams
+![t00040_class](./t00040_class.svg "Relationship and access filter test")