Added requirements.txt for easier installations of dependencies

[ssmirr]

I had trouble running the code when installing latest version of dependencies, but after some searching, I found the latest compatible versions of dependencies with the current code. requirements.txt had a list of all dependencies. To install all dependencies (with correct working versions) you can simply run:

sudo pip install -r requirements.txt

Commits in this pull request include:

• Added requirements.txt
• Updated README.md with instructions for using requirements.txt
• Updated README.md to include exact name of dependencies
• Updated README.md to include python-midi in dependencies
• Added link to the YouTube video
• Fixed markdown formatting

[akompos]

+1 This works