Add contact form

[arnoldnekemiah]

• Added a contact form
• Styled the contact form
• Added footer and styled it.
• Solved style-linter errors

[arnoldnekemiah]

Attended to all comments by the preview

• Updated Readme.md file with contact information for my collaborators
• Added link to project live demo
• Attended to the HTML and CSS issues as suggested by the reviewer.
• Solved Style-linter errors

[arnoldnekemiah]

Aligned h2 text to center as suggested by previous reviewer