docs: Create guide for creating icons in Inkscape (#81)

docs/INKSCAPE_GUIDE.md

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+# Inkscape Setup Guide
+
+This guide shows the steps to setup Inkscape for creating icons that conform to the Featherity design
+guidelines.
+
+## Setting up The Canvas
+
+When opening a new document, Inkscape will create a canvas of a default size.  To change the size to 24x24:
+
+1. Open the Document Properties dialog (File -> Document Properties).
+2. On the “Page Size” tab, under “Custom Size” set the Units to `px` and set both Height and Width to 24.
+![Setting Page Size](images/page-size.png?raw=true "Setting Page Size")
+3. On the “Grid” tab, select `Rectangular Grid` and click “New Grid”.
+![Setting Grid Properties](images/grid-1.png?raw=true "Setting Grid Properties")
+4. Set the Grid Units to `px` and set Spacing X and Spacing Y both to 1.
+![Setting Grid Properties](images/grid-2.png?raw=true "Setting Grid Properties")
+5. Close the Document Properties dialog.
+6. To center the canvas in the viewport, select View -> Zoom -> Drawing.
+   
+## Setting up The Paths
+
+1. Create a path or shape.
+2. With the path selected, open the Stroke and Fill panel by pressing `Ctrl+Shift+F` on your keyboard.
+![Stroke Style Properties](images/strokes.png?raw=true "Setting Grid Properties")
+3. On the “Stroke Style” tab:
+   * Set Stroke Width to `2px`. 
+   * Select the rounded join type.
+   * Select the rounded cap type.
+4. If the shape is a rectangle, select the rectangle and in the top of the screen below the menu bar, set `Rx` and `Ry` to `2px`.
+![Rectangle Radius Properties](images/corner-radius.png?raw=true "Rectangle Radius Properties")
+
+## Saving A File
+
+1. When ready to save the file, click Save As and select “Optimized SVG” as the file type.
+![Save As](images/save-as.png?raw=true "Save as")
+2. After clicking Save, to conform with the other icons in the package, set Pretty Printing to use spaces and set the indentation depth to 2.
+![Optimize](images/optimize-settings.png?raw=true "Optimize")