Add reusables

Author: ethanpalm

data/reusables/desktop/fork-type-prompt.md

@@ -0,0 +1 @@
+1. If you clone a repository that you don't have write access to, {% data variables.product.prodname_desktop %} will create a fork. After creating or cloning a fork, {% data variables.product.prodname_desktop %} will ask how you are planning to use the fork. Click **To contribute to the parent project** if you plan to use this fork for contributing to the original upstream repository or click **For my own purposes** if you plan to use this fork for a project not connected to the upstream. Then click **Continue**.

data/reusables/desktop/open-repository-settings.md

@@ -0,0 +1 @@
+1. If you want to change how a fork behaves with the upstream repository, open the **Repository** menu, then click **Repository settings...**.

data/reusables/desktop/select-fork-behavior.md

@@ -0,0 +1 @@
+1. Click **Fork behavior**, then select **To contribute to the parent repository** if you want the fork to make pull requests to the original upstream repository or select **For my own purposes** if you want to keep changes to the fork separate from the upstream, and then click **Save**.