Installation and contributing docs (#35)

Author: endorama

CONTRIBUTING.md

@@ -0,0 +1,55 @@
+# Contributing
+
+Thanks for considering contributing to this project!
+
+## Opening issues
+
+If you find a bug, please feel free to [open an issue](https://github.com/elastic/elastic-agent-changelog-tool/issues).
+
+## Fixing bugs
+
+We love pull requests. Here’s a quick guide:
+
+1. [Fork this repository](https://github.com/elastic/elastic-agent-changelog-tool/fork) and then clone it locally:
+
+  ```bash
+  $ git clone https://github.com/elastic/elastic-agent-changelog-tool
+  $ cd elastic-agent-changelog-tool
+  $ make build # ensure building the binary works
+  $ make test # ensure tests are green
+  ```
+
+2. Create a topic branch for your changes:
+
+  ```bash
+  git checkout -b fix-for-that-thing
+  ```
+3. Commit a failing test for the bug:
+
+  ```bash
+  git commit -am "Adds a failing test to demonstrate that thing"
+  ```
+
+4. Commit a fix that makes the test pass:
+
+  ```bash
+  git commit -am "Adds a fix for that thing!"
+  ```
+
+5. Run the tests:
+
+  ```bash
+  make test
+  ```
+
+6. If everything looks good, push to your fork:
+
+  ```bash
+  git push origin fix-for-that-thing
+  ```
+
+7. [Submit a pull request.](https://help.github.com/articles/creating-a-pull-request)
+
+## Adding new features
+
+[Open an issue](https://github.com/elastic/elastic-agent-changelog-tool/issues) and let’s design it together.

README.md

@@ -5,3 +5,7 @@ Tooling to manage the changelog for beats, Elastic Agent and Fleet Server
 
 `git` CLI should be installed and available.
 [`go-licenser`](https://github.com/elastic/go-licenser) CLI should be installed and available.
+
+## Contributing
+
+Thinking of contributing? Thank you! Look at [`./CONTRIBUTING.md`](./CONTRIBUTING.md) for guidelines.

docs/install.md

@@ -0,0 +1,30 @@
+# Installation
+
+## Install from release binary
+
+Download latest release from the [Releases](https://github.com/elastic/elastic-agent-changelog-tool/releases/latest) page.
+
+On macOS, use `xattr -r -d com.apple.quarantine elastic-agent-changelog-tool` after downloading to allow the binary to run.
+
+## Install with go install
+
+If you have a `go` development environment setup, you can use `go install`:
+
+```
+$ go install github.com/elastic/elastic-agent-changelog-tool@latest
+```
+
+_Please make sure that you've correctly [setup environment variables](https://golang.org/doc/gopath_code.html#GOPATH) -
+`$GOPATH` and `$PATH`, and `elastic-agent-changelog-tool` should be accessible from your `$PATH`._
+
+## Install from source code
+
+If you have a `go` development environment, you can clone this repo and build the source files with:
+
+```
+$ git clone https://github.com/elastic/elastic-agent-changelog-tool.git
+$ cd elastic-agent-changelog-tool
+$ make build
+```
+
+`elastic-agent-changelog-tool` binary will be created in the root folder.