add bash tutorial

.gitmodules

@@ -1,3 +1,7 @@
 [submodule "docs/tutorials/learngit"]
 	path = docs/tutorials/learngit
 	url = https://github.com/envs-net/learngit.git
+
+[submodule "docs/tutorials/bash-guide"]
+	path = docs/tutorials/bash-guide
+	url = https://github.com/Idnan/bash-guide.git

docs/tutorials/bash-guide/.github/FUNDING.yml

@@ -0,0 +1,4 @@
+# These are supported funding model platforms
+
+github: [idnan]
+custom: https://paypal.me/id9a9

mkdocs.yml

@@ -24,3 +24,4 @@ nav:
         - common commands: tutorials/learngit/docs/common_commands.md
         - branching strategies: tutorials/learngit/docs/branching_strategies.md
         - troubleshooting: tutorials/learngit/docs/troubleshooting.md
+    - bash guide: tutorials/bash-guide/README.md