Add 1.27 rc0 documentation (#453)

Reviewed-on: https://gitea.com/gitea/docs/pulls/453
Reviewed-by: Zettat123 <39446+zettat123@noreply.gitea.com>

versioned_docs/version-1.27/usage/packages/cran.md

@@ -0,0 +1,91 @@
+---
+date: "2023-01-01T00:00:00+00:00"
+slug: "cran"
+sidebar_position: 35
+---
+
+# CRAN Package Registry
+
+Publish [R](https://www.r-project.org/) packages to a [CRAN](https://cran.r-project.org/)-like registry for your user or organization.
+
+## Requirements
+
+To work with the CRAN package registry, you need to install [R](https://cran.r-project.org/).
+
+## Configuring the package registry
+
+To register the package registry you need to add it to `Rprofile.site`, either on the system-level, user-level (`~/.Rprofile`) or project-level:
+
+```
+options("repos" = c(getOption("repos"), c(gitea="https://gitea.example.com/api/packages/{owner}/cran")))
+```
+
+| Parameter | Description |
+| --------- | ----------- |
+| `owner`   | The owner of the package. |
+
+If you need to provide credentials, you may embed them as part of the url (`https://user:password@gitea.example.com/...`).
+
+## Publish a package
+
+To publish a R package, perform a HTTP `PUT` operation with the package content in the request body.
+
+Source packages:
+
+```
+PUT https://gitea.example.com/api/packages/{owner}/cran/src
+```
+
+| Parameter | Description |
+| --------- | ----------- |
+| `owner`   | The owner of the package. |
+
+Binary packages:
+
+```
+PUT https://gitea.example.com/api/packages/{owner}/cran/bin?platform={platform}&rversion={rversion}
+```
+
+| Parameter  | Description |
+| ---------- | ----------- |
+| `owner`    | The owner of the package. |
+| `platform` | The name of the platform. |
+| `rversion` | The R version of the binary. |
+
+For example:
+
+```shell
+curl --user your_username:your_password_or_token \
+     --upload-file path/to/package.zip \
+     https://gitea.example.com/api/packages/testuser/cran/bin?platform=windows&rversion=4.2
+```
+
+If you are using 2FA or OAuth use a [personal access token](development/api-usage.md#authentication) instead of the password.
+
+You cannot publish a package if a package of the same name and version already exists. You must delete the existing package first.
+
+The server responds with the following HTTP Status codes.
+
+| HTTP Status Code  | Meaning |
+| ----------------- | ------- |
+| `201 Created`     | The package has been published. |
+| `400 Bad Request` | The package is invalid. |
+| `409 Conflict`    | A package file with the same combination of parameters exists already. |
+
+## Install a package
+
+To install a R package from the package registry, execute the following command:
+
+```shell
+install.packages("{package_name}")
+```
+
+| Parameter      | Description |
+| -------------- | ----------- |
+| `package_name` | The package name. |
+
+For example:
+
+```shell
+install.packages("testpackage")
+```