added page with templates and crow applications to mkdocs

docs/getting_started/project_templates_and_applications.md

@@ -0,0 +1,16 @@
+Here we collect samples and applications.
+
+# Template projects 
+
++ [https://github.com/gittiver/crow_template](https://github.com/gittiver/crow_template)
+  - Features: 
+    - github template repository
+    - uses CPM for including crow into project
+    - catch2 for testing
+
++ [https://github.com/seobryn/corax-template](https://github.com/seobryn/corax-template)
+
+	- Features
+		- `Scripts` to Make, Compile and Clean the build
+		- `Libs` Folder to store all the external Libs, Crow is set by default.
+		- Format rules using  `clang-format`

mkdocs.yml

@@ -54,6 +54,7 @@ nav:
       - Linux: getting_started/setup/linux.md
       - MacOS: getting_started/setup/macos.md
       - Windows: getting_started/setup/windows.md
+    - Project templates and applications: getting_started/project_templates_and_applications.md    
     - Your First Application: getting_started/your_first_application.md
     - A Simple Webpage: getting_started/a_simple_webpage.md
   - Guides: