Add contributing notes (#46)

CONTRIBUTING.md

@@ -0,0 +1,38 @@
+# Contributing
+
+Thanks for your interest in contributing!
+
+## Contributing issues
+
+Please feel free to open an issue if you think something is working incorrectly,
+if you have a feature request, or if you just have any questions.  No templates
+are in place, all I ask is that you provide relevant information if you believe
+something is working incorrectly so we can sort it out quickly.
+
+## Contributing code
+
+All contributions should have an associated issue.  If you are at all unsure
+about how to solve the issue, please ask!  I'd rather chat about possible
+solutions than have someone spend hours on a PR that requires a lot of major
+changes.
+
+Test coverage is important.  If you end up with a small (<1%) drop, I'm happy to
+help cover the gap, but generally any new features or changes should have some
+tests as well.  If you're not sure how to test something, feel free to ask!
+
+Linting can be done with `make lint`.  Running `fmt` can be done with `make fmt`.
+Tests can be run with `make test`.
+
+Doing all these before submitting the PR can help you pass the existing
+gatekeeping tests without having to wait for them to run every time.
+
+The name of the PR, commit messages, and branch names aren't very important,
+there are no special triggers or filters or anything in place that depend on names.
+The name of the PR should at least reasonably describe the change, because this
+is what people will see in the commit history and what goes into the change logs.
+
+Exported functions should generally follow the pattern of returning a `Model`
+and not use a pointer receiver.  This matches more closely with the flow of Bubble
+Tea (and Elm), and discourages users from making mutable changes with unintended
+side effects.  Unexported functions are free to use pointer receivers for both
+simplicity and performance reasons.

README.md

@@ -13,6 +13,11 @@ A customizable, interactive table component for the
 
 [View above sample source code](./examples/pokemon/main.go)
 
+## Contributing
+
+Contributions welcome, please [check the contributions doc](./CONTRIBUTING.md)
+for a few helpful tips!
+
 ## Features
 
 For a code reference of all available features, please see the [full feature example](./examples/features/main.go).
@@ -143,9 +148,3 @@ make example-dimensions
 go run ./examples/pagination/main.go
 ```
 
-## Contributing
-
-Contributions welcome, but since this is being actively developed for use in
-[Khan](https://github.com/evertras/khan) please check first by opening an issue
-or commenting on an existing one!
-