build: Initial commit

[chloe1818]

Issue #, if available:

Description of changes:
Edited README, tests, and added example workflow.

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[greyshi]

Just had one minor comment. Overall looks good, except the two commits you're adding both have the message "initial commit". Can you change the commit messages so they describe what's actually in each commit?

[greyshi]

Each of these runtimes will have varying build tools and steps that will be different between customers. We can instead say: "To automate building your source code, add a build step based on your runtime and build process. Below are two commonly used examples for Node.js and Python"