Created a new guide about the mkdir command in linux (#19301)

* Created a guide about the mkdir command

* Update index.md

* Added a guide for the rm command in bash

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

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+---
+title: Bash mkdir
+---
+
+## Bash command: mkdir
+
+
+**Make a Directory** ,for example `mkdir hello`.
+
+### More Information:
+* [Wikipedia](https://en.wikipedia.org/wiki/Mkdir)

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

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+---
+title: Bash rm
+---
+
+## Bash command: rm
+
+**Delete a File/Directory** ,for example `rm hello`.
+
+There are few commonly used arguments:
+
+- `r` , means to recursively delete all the folders inside a directory.
+- `f` , means to forcefully delete anything folder or file.
+
+### More Information:
+* [Wikipedia](https://en.wikipedia.org/wiki/Rm_(Unix))