Touch up CONTRIBUTING docs 💅

.github/CONTRIBUTING.md

@@ -12,21 +12,31 @@ Please do:
 
 * open an issue if things aren't working as expected
 * open an issue to propose a significant change
-* open a PR to fix a bug
-* open a PR if a member of the GitHub CLI team has given the ok after discussion in an issue
+* open a pull request to fix a bug
+* open a pull request if a member of the GitHub CLI team has given the ok after discussion in an issue
+
+## Building the project
+
+Prerequisites:
+- Go 1.13
+
+Build with: `make` or `go build -o bin/gh ./cmd/gh`
+
+Run the new binary as: `./bin/gh`
+
+Run tests with: `make test` or `go test ./...`
 
 ## Submitting a pull request
 
-0. Clone this repository
-0. Create a new branch: `git checkout -b my-branch-name`
-0. Make your change, add tests, and ensure tests pass
-0. Make a PR: `gh pr create --web`
+1. Create a new branch: `git checkout -b my-branch-name`
+1. Make your change, add tests, and ensure tests pass
+1. Submit a pull request: `gh pr create --web`
 
 Contributions to this project are [released][legal] to the public under the [project's open source license][license].
 
 Please note that this project adheres to a [Contributor Code of Conduct][code-of-conduct]. By participating in this project you agree to abide by its terms.
 
-We generate manual pages from source on every release! You do not need to submit PRs for those specifically; the docs will get updated if your PR gets accepted.
+We generate manual pages from source on every release. You do not need to submit pull requests for documentation specifically; manual pages for commands will automatically get updated after your pull requests gets accepted.
 
 ## Resources