added content to adapters.md

[A1Liu]

No description provided.

[A1Liu]

So based on comments from @Bad-Science on the previous pull request, I'm thinking of the following:

• The example code should be written in a high level language - The code should look as similar to pseudo-code as possible. The more abstract the syntax is, the easier it will be to generalize and explain concisely
• The example code should use as few packages as possible - Using packages requires some level of explanation with what each package does, and what the syntax of each means.

Maybe the example adapter code should be in python?

[A1Liu]

We can probably finish some kind of preliminary adapter for the gallatin course search api and use it to explain the whole adapter process

[Bad-Science]

@A1Liu Agreed, python is probably a good common denominator. Let's get this first adapter or so done and then we can get back to work on this.