[Solved] "Get the difference between two text paragraphs(Ever used `git diff` !)"

[brendanAlbert]

Resolves Issue #14

Description

• [x] apply required CSS to the diff paragraph, for example red marks for the words which are missing and green for the words which are newly added.
• [x] a GUI for showing the above is not necessary but remarkable.

How to run

1. Open the html file, index.html, using your favorite browser.
2. Notice there are 3 paragraph boxes. The top left or first paragraph box is the source of truth. It is used to show the difference between its text and whatever is contained in the top right or second paragraph box.
3. Any text in the same position in both boxes will just display in the third box with out a background. Any text in the first box that is not in the second, will display in the third box and will have a green background. Any text in the second box that is not matched in the first box will display with a red background in the third box.

Checklist

• [x] Code compiles correctly.
• [x] Changes are tested properly.
• [x] Added the README / documentation, if necessary.
• [x] Followed the Contributing guidelines.
• [x] Resolved merge conflicts, if any.