Add code convention recommendations about teleirc HOT 2 CLOSED

Discussed in 2020-03-07 meeting.

For the v2.x.x release, this issue is not about linting (see #256). The code style code is a one-page doc that covers more semantics that are specific to our project. To track this, a list of those things is below:

• Naming conventions
• Patterns for writing new handlers
• Interfaces

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Discussed in 2020-04-11 meeting.

I updated the issue title to focus more on what this is. Since our CI pipeline already enforces things like gofmt and golint, style is not a huge concern for documentation. However, the "human" semantics of how we do things like in the last post are better examples of what goes into a doc like this.

To reiterate, this doc will probably not be very long. If we keep to the three sections outlined in the last comment, it might be 2-3 sentences for each section. It should not be a very verbose doc.

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