Add Chapter 6

* Finished exercises in Chapter 6

* Finished extra credit
Add Chapter 7

* Finished Chapter 7 exercises

* Finished extra credit for Chapter 7
Add Chapter 8

* Finished exercises in Chapter 8

* Finished Chapter 8's extra credit
Add Chapter 9

  * Finished Chapter 9 exercises

  * Finished extra credit for Chapter 9
Add Chapter 10

  * Finished exercises in Chapter 10

  * Completed extra credit in Chapter 10
trying git add for multiple files
Add three files at one

  * Misc, Readme.md and intro

  * enter Misc/ as 'git add Misc'
	- the / cause "can't find path" problem