manually add linux guide by @NightYoshi370 and @luigoalma

_pages/en_US/formatting-sd-(linux).txt

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+---
+title: "Formatting SD (Linux)"
+---
+
+{% include toc title="Table of Contents" %}
+
+### Required Reading
+
+This is an add-on section for formatting an SD card to work with the 3DS.
+
+If the 3DS already recognizes the SD card, this guide is not required.
+
+This page is for Linux users only. If you are not on Linux, check out the [Formatting SD (Windows)](formatting-sd-(Windows)) or [Formatting SD (Mac)](formatting-sd-(mac)) pages.
+
+### Instructions
+#### Section I - Determining which slot your SD card is in
+
+1. Make sure your SD card is **not** inserted
+1. Launch the Linux Terminal
+1. Type `watch "lsblk"`
+1. Insert your SD card into your PC
+1. Observe the output. It should match something like this:
+```
+NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
+mmcblk0     179:0    0   3,8G  0 disk
+└─mmcblk0p1 179:1    0   3,7G  0 part /run/media/user/FFFF-FFFF
+```
+1. Take note of the device mount point. In our example above, it was `mmcblk0`
+  + If `RO` is set to 1, make sure the lock switch is not slid down
+1. Hit CTRL + C to exit the menu
+
+#### Section II - Formatting the card
+
+![](https://upload.wikimedia.org/wikipedia/commons/8/85/Cfdisk_screenshot.png)
+
+1. Type in `sudo cfdisk /dev/(device mount point from above)`
+1. On each partition, hit `Delete`
+1. Create a new Primary partition that covers the size of your entire SD card
+  + This will create a new partition with the linux filetype
+1. Select type and take a look at the menu
+1. Find "W95 FAT32" and take note of the code on the left side of that text
+1. Press any key, then enter the code you took note of in the previous step
+1. Hit enter, then hit Quit
+
+### Return to [Get Started](get-started)
+{: .notice--primary}