Add first draft of troubleshooting page

help/index.md

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+---
+layout: default
+title: Help
+nav_order: 9
+has_children: true
+---
+
+1. TOC
+{:toc}

help/troubleshooting.md

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+---
+layout: default
+title: Troubleshooting
+nav_order: 2
+parent: Help
+---
+
+1. TOC
+{:toc}
+
+# Post-Build Troubleshooting
+
+This page offers remedies to common problems after completing your build. If your problem is not covered, or the offered solution does not help, please feel free ask the community on Discord: [bstkbd.com/discord](https://www.bstkbd.com/discord)
+
+## One or more keys don't work!
+
+A single key, which has neighbors that work, not working, is most often caused by either a faulty switch, or diode to column discontinuity.
+
+You can either try measuring those with a multimeter, or turn the board on and bridge the diode's cathode to the right switch leg. If that produces a keypress, you can narrow it down further by bridging from the cathode to the left switch leg (diode to switch discontinuity), and, separately, between the two switch legs (faulty switch).
+
+TODO: Images, explain how to locate diode and its cathode
+
+## One or more rows or columns don't work!
+
+If an entire row or column does not work, the most common cause is a broken row or column trace.
+TODO: more, images
+
+## The board turns off immediately when I plug in the USB connection!
+
+wow, such short, very fire
+TODO: explain, mention shorts, leds orientation
+
+## One or more LEDs don't work!
+
+TODO: explain chained nature, add pinout diagram
+
+## The LEDs flicker or change color randomly!
+
+TODO: explain chained nature, bad soldering