Replace urls in Markdown with Links

[edison12a]

Improve formatting of Markdown documents by replacing urls with links.

For example:
On Line 25 in README.md: Replace https://momodeveloper.mtn.com with MoMo Developer Portal to make the link clickable by a developer.

[raybesiga]

Hi @SimiCode thank you for creating this issue. Please find a link to the update contributing guide here. We look forward to your contributions going forward.