Created the guide for the chmod command (#19408)

* Created a guide about the mkdir command

* Update index.md

* Added a guide for the rm command in bash

* Created a new guide for the chmod command

client/src/pages/guide/english/bash/bash-chmod/index.md

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+---
+title: Bash chmod
+---
+
+## Bash command: chmod
+
+**Change the permissions of a File/Directory** ,for example `chmod u+x hello.py`.(Gives the user the permission to execute the file)
+
+
+### More Information:
+* [Wikipedia](https://en.wikipedia.org/wiki/Chmod)