Docs: Add guide for developing on macOS (#19464)

docs/sources/contribute/development/_index.md

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+title = "Development"
+type = "docs"
+[menu.docs]
+name = "Development"
+identifier = "development"
+parent = "contribute"
+weight = 2
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+
+# Development

docs/sources/contribute/development/developing-on-macos.md

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+title = "Developing on macOS"
+description = "Developing on macOS"
+type = "docs"
+[menu.docs]
+parent = "development"
+weight = 1
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+
+# Developing on macOS
+
+This guide helps you get started developing Grafana on macOS.
+
+## Dependencies
+
+Make sure you have the following dependencies installed before moving on to set up your developer environment:
+
+- [Git](https://git-scm.com/)
+- [Go](https://golang.org/dl/)
+- [Node.js (Long Term Support)](https://nodejs.org)
+- [Yarn](https://yarnpkg.com)
+
+We recommend using [Homebrew](https://brew.sh/) for installing any missing dependencies:
+
+```
+brew install git
+brew install go
+brew install node
+
+npm install -g yarn
+```
+
+## Download Grafana
+
+We recommend using Go to download the source code for the Grafana project:
+
+1. Add `export GOPATH=$HOME/go/` to the bottom of your `$HOME/.bash_profile`.
+1. Open a terminal and run `go get github.com/grafana/` in your terminal. This command downloads, and installs Grafana to your `$GOPATH`.
+1. Open `$GOPATH/src/github.com/grafana/grafana` in your favorite code editor.
+
+## Build Grafana
+
+Grafana consists of two components; the _frontend_, and the _backend_.
+
+### Frontend
+
+Before we can build the frontend assets, we need to install the dependencies:
+
+```
+yarn install --pure-lockfile
+```
+
+When this is done, we can start building our source code:
+
+```
+yarn start
+```
+
+Once `yarn start` has built the assets it will continue to do so whenever any of the files change. This means you don't have to manually build the assets whenever you've made a change to the code.
+
+Next, we'll build the web server that will serve the frontend assets we just built.
+
+### Backend
+
+Build and run the backend, by running `make run` in the root directory of the repository. This command will compile the Go source code, and start a web server.
+
+By default, the web server will be served at `http://localhost:3000/`.
+
+Log in using the default credentials:
+
+| username | password |
+|----------|----------|
+| `admin`  | `admin` |
+
+When you log in for the first time, you'll be asked to change your password.
+
+## Test Grafana
+
+The tests for the frontend are written using [jest](https://jestjs.io/). Run them using yarn:
+
+```
+yarn jest
+```
+
+If you're developing for the backend, run the tests with the standard Go tool:
+
+```
+go test -v ./pkg/...
+```
+
+## Add data sources
+
+By now, you should be able to build and test a change you've made to the Grafana source code. Most likely though, you're going to need to add a few data sources to verify the change you made.
+
+To set up data sources for your development environment, go to the `devenv` directory in the Grafana repository:
+
+```
+cd devenv
+```
+
+Run the `setup.sh` script to setup a set of data sources and dashboards in your local Grafana. Data sources are named **gdev-\<type\>**, and dashboards are located in a folder called **gdev dashboards**.
+
+Some of the data sources require databases to run in the background.
+
+Installing and configuring databases can be a tricky business. Grafana uses [Docker](https://docker.com) to make the task of setting up databases a little easier. Make sure you [install Docker](https://docs.docker.com/docker-for-mac/install/) before proceeding to the next step.
+
+In the root directory of your Grafana repository, run the following command:
+
+```
+make devenv sources=influxdb,loki
+```
+
+The script generates a Docker Compose file with the databases you specify as `sources`, and runs them in the background.
+
+See the repository for all the [available data sources](https://github.com/grafana/grafana/tree/master/devenv/docker/blocks). Note that some data sources have specific Docker images for macOS, e.g. `prometheus_mac`.
+
+## Learn more
+
+- [How to contribute to Grafana as a junior dev](https://medium.com/@ivanahuckova/how-to-contribute-to-grafana-as-junior-dev-c01fe3064502) by [Ivana Huckova](https://medium.com/@ivanahuckova).