Modified Stylish Blockquote by adding blockquote color

[aditya-an1l]

Made changes in the stylish-blockquotes.css
By default, the colour of the blockquote is grey.

However, it would look good (or stylish in a literal sense), if the block quote symbol had the same accent colour as that of the theme the user is using.

Something like this:

This is a minor change, but felt necessary for to add a stylish element to the stylish blockquote snipet.

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Here is an objective summary of what all changes are made:
[+] Added a line of code in the CSS snippet of Stylish Blockquotes (code/css-snippets/stylish-blockquotes.css).
[+] Added a preview in the README.md

[aditya-an1l]

Any Updates?
Thought to give some reference to the checklist in the Contributing.md file. I have followed the checklist to best of my knowledge.

• Abide by the already established style of the list.
  • If you addition is part of a table, make sure it is correctly formatted.
  • If the section has a table of contents, update that as well.
• Make sure your addition is part of the correct section/category.
• Don't sneak in line.
• If your addition is a CSS snippet, make sure that the CSS file is named fittingly, and that you include an example image in the README.