adding slicing of string (bobbyiliev#38)

closes bobbyiliev#17

Added a new chapter: Bash Redirection. (bobbyiliev#37)

* added a new chapter 023-bash-redirection.md

* added the new chapter to README.md

* fixed typos in 023-bash-redirection.md

Multiple conditions (bobbyiliev#34)

* Add multiple conditions example

Add Exit status operators (bobbyiliev#35)

fix typos (bobbyiliev#31)

Typo fixes :) (bobbyiliev#30)

Added Indexing To Readme (bobbyiliev#29)

* Added Index Hyperlink

* Added Index Hyperlink

Fix typo (bobbyiliev#27)

Fix typo

Add comments to functions (bobbyiliev#26)

Fixed typo (bobbyiliev#25)