all: add Contributing.md

For golang/go#64818

Change-Id: Icf66f87493cddcb50b875be913b539ba5c31e01e
Reviewed-on: https://go-review.googlesource.com/c/wiki/+/558636
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Commit-Queue: Hyang-Ah Hana Kim <hyangah@gmail.com>

Contributing.md

@@ -0,0 +1,76 @@
+---
+title: Contributing
+---
+
+The contents of https://go.dev/wiki are hosted in the [go.googlesource.com/wiki](https://go.googlesource.com/wiki) repository,
+and is also mirrored on https://github.com/golang/wiki.
+
+These contents are served by the same server that hosts the official Go website https://go.dev/.
+The server's source is located in the [go.googlesource.com/website](https://go.googlesource.com/website) repository.
+
+## Reporting issues
+
+For issues related to existing contents, the preferred method of resolution is to send a [change](#sending-a-change-github).
+
+However, if you would like to add a new page, please first open an issue in the [Go issue tracker](https://go.dev/issues/new?title=wiki:) with the prefix `wiki:` to propose the addition. Clearly state why the content does not fit into any of the existing pages.
+
+Because renaming of pages in the wiki can break external links, please open an issue before renaming or removing any wiki page.
+
+If the issue pertains to the serving of contents, please open a [GitHub issue](https://go.dev/issues/new?title=x/website:).
+
+### Triaging issues
+
+To address content-related issues, it is recommended to identify the person or team most familiar with the content in question.
+A good starting point is the [project owners](https://dev.golang.org/owners) page.
+
+For issues related to content serving, follow the usual triaging process similar to x/website issues
+and label them with `website`.
+
+## Updating contents
+
+Before making changes, ensure familiarity with the code review process outlined in
+the official [Contribution Guide](/doc/contribute).
+
+### Sending a trivial change
+
+For minor updates such as fixing typos and adding missing links, you can use
+the [GitHub flow](https://docs.github.com/en/get-started/using-github/github-flow).
+Make edits from the [GitHub repo](https://github.com/golang/wiki) and open a GitHub pull request as you normally would.
+
+Additional information is available at [Sending a change via GitHub](/doc/contribute#sending_a_change_github).
+
+### Sending a non-trivial change
+
+For larger changes, consider sending your change through Gerrit following the instructions provided in
+[Sending a change via Gerrit](/doc/contribute#sending_a_change_gerrit).
+
+The canonical repository for wiki content is located at `go.googlesource.com/wiki`.
+
+```
+$ git clone https://go.googlesource.com/wiki
+```
+<!-- TODO: describe supported markdown syntaxes, and how to test local changes -->
+
+## Reviewing and submitting changes
+
+Unlike other Go repositories, the submission process for the wiki repository
+requires only one +2 from anyone in the wiki repository maintainers group.
+See [Proposal 61940](https://go.dev/issues/61940) for additional background.
+
+**Note for reviewers**: once you give your +2 and all comments are addressed,
+please merge the change soon to avoid merge conflicts.
+
+Anyone interested in receiving notifications about incoming wiki CLs
+can opt-in through their [Gerrit notifications](https://go-review.googlesource.com/settings/#Notifications).
+
+## Changing and testing the contents serving behavior
+
+[`golang.org/x/website/cmd/golangorg`](https://golang.org/x/website/cmd/golangorg)
+is the program that serves the wiki pages.
+
+```
+$ git clone https://go.googlesource.com/website
+$ cd website/cmd/golangorg
+```
+
+Follow the [instructions in README.md](https://cs.opensource.google/go/x/website/+/master:cmd/golangorg/README.md) for running and testing the program locally.

index.md

@@ -14,10 +14,11 @@ Please do not ask questions by editing or creating a wiki page.  Any such change
 
 ## Contributing
 
-- This wiki is open to editing by any member of the Go community with a GitHub account.
-- If you would like to add a new page, please first open an issue in the [Go issue tracker](https://github.com/golang/go/issues) with the prefix 'wiki' to propose the addition. Clearly state why the content does not fit into any of the existing pages.
+- If you would like to add a new page, please first open an issue in the [Go issue tracker](https://go.dev/issues/new?title=wiki:) with the prefix `wiki:` to propose the addition. Clearly state why the content does not fit into any of the existing pages.
 - Because renaming of pages in the wiki can break external links, please open an issue before renaming or removing any wiki page.
 
+See [Contributing](Contributing) for more information on contributing.
+
 # Table of Contents
 
 - [Getting started with Go](#getting-started-with-go)