Adding more colors in the color script #9

[Priyanshu-2005]

Fixes #9

Added more colors.

When we will run the script in terminal the output will be like as shown in following images:

Command used:
bash color <color_name> && echo "hello"

Command used:
bash color reset

[ecxtacy]

@Priyanshu-2005 thanks for contributing here. I have not manually tested it yet, but you can do the following improvements in PR description.

1. Write Fixes #issue-number in the PR description, not just issue #issue-number

2. Use proper capitalisation and punctuation.

3. Use the backtick (`) when mentioning code lines. like this Proper formatting is a must for a great PR.

[Priyanshu-2005]

@ecxtacy I have edited the description acccording to the suggestions.
I will definitely follow them for other PRs too.

[rootCircle]

Great work @Priyanshu-2005! Can you handle checks for when no args is passed as well? Currently it errors out

[rootCircle]

ping me here when you're done with those, so we can move forward with your PR!

[Priyanshu-2005]

@rootCircle Now the code script would be able to handle the error we that were getting on passing no arguments.

Commands Used:
bash color
bash color magenta && echo hello

[rootCircle]

LGTM 👍 Thanks for your contribution!