Add page to document how to set up a dev environment

docs/developer/development-environment.md

@@ -0,0 +1,44 @@
+---
+title: 'Development environment'
+license: 'Apache-2.0'
+origin_url: 'https://github.com/go-gitea/gitea/blob/ec1feedbf582b05b6a5e8c59fb2457f25d053ba2/docs/content/development/hacking-on-gitea.en-us.md'
+---
+
+This page lists a few options to set up a productive development environment for working on Forgejo.
+
+## VS Codium
+
+[VS Codium](https://vscodium.com/) is an open source version of the Visual Studio Code IDE.
+The [Go integration for Visual Studio Code](https://code.visualstudio.com/docs/languages/go) works
+with VS Codium and is a viable tool to work on Forgejo.
+
+First, run `cp -r contrib/ide/vscode .vscode` to create new directory `.vscode` with the contents of folder [contrib/ide/vscode](https://codeberg.org/forgejo/forgejo/src/branch/forgejo/contrib/ide/vscode) at the root of the repository. Then, open the project directory in VS Codium.
+
+You can now use `Ctrl`+`Shift`+`B` to build the gitea executable and `F5` to run it in debug mode.
+
+Tests can be run by clicking on the `run test` or `debug test` button above their declaration.
+
+Go code is formatted automatically when saved.
+
+## Emacs
+
+Emacs has [a Go mode](https://github.com/dominikh/go-mode.el) that can likely be used to work on Forgejo's code base.
+Do you know how to configure it properly? Why not document that here?
+
+## Vim
+
+Vim has [a Go plugin](https://github.com/fatih/vim-go) that can likely be used to work on Forgejo's code base.
+Do you know how to configure it properly? Why not document that here?
+
+## GoLand
+
+Clicking the `Run Application` arrow on the function `func main()` in `/main.go`
+can quickly start a debuggable Gitea instance.
+
+The `Output Directory` in `Run/Debug Configuration` MUST be set to the
+gitea project directory (which contains `main.go` and `go.mod`),
+otherwise, the started instance's working directory is a GoLand's temporary directory
+and prevents Gitea from loading dynamic resources (eg: templates) in a development environment.
+
+To run unit tests with SQLite in GoLand, set `-tags sqlite,sqlite_unlock_notify`
+in `Go tool arguments` of `Run/Debug Configuration`.

docs/developer/index.md

@@ -12,6 +12,7 @@ their needs.
   - [Sustainability and funding](https://codeberg.org/forgejo/sustainability)
 - For contributors
   - [Compiling from source](./from-source/)
+  - [Development environment](./development-environment/)
   - [Interface customization](./customization/)
   - [Architecture overview](./architecture/)
   - [Developer Certificate of Origin (DCO)](./dco/)