adding git submodule

Also changed the url of katacoda scenarios submodule

Author: nikiOstrov

.gitmodules

@@ -1,7 +1,11 @@
 [submodule "katacoda-scenarios"]
 	path = katacoda-scenarios
-	url = https://github.com/devonfw/katacoda-scenarios.git
+	url = https://github.com/devonfw-tutorials/katacoda-scenarios.git
 	branch = master
+[submodule "wiki-tutorials"]
+	path = wiki-tutorials
+	url = https://github.com/devonfw-tutorials/wiki-tutorials.git
+	branch = main
 [submodule "devonfw-guide"]
 	path = devonfw-guide
 	url = https://github.com/devonfw/devonfw-guide.git