update CONTRIBUTING.md

CONTRIBUTING.md

@@ -24,3 +24,45 @@ If your repo has certain guidelines for contribution, put them here ahead of the
 
 - [Slack channel](https://kubernetes.slack.com/messages/sig-cli)
 - [Mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-cli)
+
+## Setup a Dev Environment
+
+- install [go](https://golang.org/doc/install)
+- `export GO111MODULE=on`
+- install [wire](https://github.com/google/wire/)
+
+## Build and Test
+
+1. `go generate`
+  - Generates the `wire_gen.go` files
+1. `go test ./...`
+  - Test the
+1. `golint -min_confidence 0.9 ./...`
+  - Look for errors
+1. `go build`
+  - Build the binary
+
+## Dependency Injection
+
+This repo uses Dependency Injection for wiring together the Commands.  See the
+[wire tutorial](https://github.com/google/wire/tree/master/_tutorial) for more on DI.
+
+## Adding a Command
+
+1. Add a new package for your cobra command under `cmd/`
+  - e.g. `kubectl apply status` would be added under `cmd/apply/status`
+  - Add it to the parent command
+  - Copy an existing command as an example
+1. Add a new package that contains the library for your command under `internal/pkg`
+  - e.g. `kubectl apply status` library would be added under `internal/pkg/status`
+  - Invoke it from the command you added
+  - Copy an existing package as an example
+1. Add the DI wiring for your library
+  - Edit `internal/pkg/wiring/wiring.go` - Add your struct to the `ProviderSet` list
+  - Edit `internal/pkg/wiring/wire.go` - Add an `Initialize` function for you struct
+
+## Adding a Library (non-internal)
+
+1. Add a new package for your library under `pkg`
+1. Add a new package that contains the implementation under `internal/pkg`
+  - Invoke it from your public package