add clone docs with images used to show how to add the remote

docs/technical-setup/clone-the-repo.md

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+# Clone the repository
+
+After [forking the `OpenScPCA` repository](./fork-the-repo.md), you will need to _clone_ your forked repository to your computer.
+Cloning provides you with a local copy of the repository to work with.
+You will need to clone the repository to every computer (or remote server) you want to use to contribute to the project.
+
+!!! note
+    You should clone your forked repository, _not_ `AlexsLemonade/OpenScPCA-analysis`.
+
+
+## Clone your forked repository
+
+Please follow the [instructions in this GitKraken video](https://help.gitkraken.com/gitkraken-client/open-clone-init/#cloning-an-existing-project) to clone your repository.
+
+This video presents two approaches to cloning: `Clone with URL`, and Clone based on your integrated `GitHub.com` account.
+Either approach is fine to take!
+
+While watching these instructions, please bear in mind the following:
+
+- Do not change the "Full path" field when cloning.
+You should retain the folder name `OpenScPCA-analysis`.
+- You can feel free to ignore all references to `LFS` ("large file storage") in this video.
+This does not apply to `OpenScPCA-analysis`.
+
+## Add the upstream repository as a remote
+
+The next step is to link the upstream repository (`AlexsLemonade/OpenScPCA-analysis`) as a remote.
+A _remote_ is a repository on GitHub.com that you are connected to.
+For example, your forked repository on GitHub.com is your _origin remote_.
+
+Adding the `AlexsLemonade` _upstream remote_ will allow you to interact with it from your computer which can you keep your fork in sync with the `OpenScPCA` project.
+But, you will still be working in your fork when writing analysis code.
+
+Follow these steps to add the upstream remote:
+
+1. From your repository in GitKraken, hover over the `1/1` text on the left-hand side `Remote` menu.
+This text will then turn into a plus-sign icon.
+Click that icon.
+![Click button to add the remote.](../img/add-upstream-remote-1.png){width="600"} <!-- No new line above, to keep tabbed in -->
+
+2. The following screen will prompt you to add a remote.
+Select `AlexsLemonade/OpenScPCA-analysis` from the dropdown menu, and click the button `Add remote`.
+![Add the upstream remote.](../img/add-upstream-remote-2.png){width="400"} <!-- No new line above, to keep tabbed in -->
+
+3. You should then see a second remote called `AlexsLemonade` on the left-hand side `Remote` menu.
+The specific listed items under this remote that you see will look different from the screenshot below; this is expected.
+As long as you see that `AlexsLemonade` is listed in the menu, you have successfully added the upstream remote.
+![View the added remote.](../img/add-upstream-remote-3.png){width="325"} <!-- No new line above, to keep tabbed in. Width needs to be >=325 for proper spacing, it seems. -->