Created Submap testing (markdown)

Submap-testing.md

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+# Submap testing process
+
+First make sure you have a .map file.  To replicate the error, goteguru needs the .map file and instructions of what you did.
+
+To make the exact submap position easier, we need to use a fixed zoom value instead of rolling the mouse wheel.  A fixed zoom can be done by pressing the digits at the top, from 2 to 9 to provide 2x to 9x zoom, or setting the scale parameter in the URL.
+
+By default, pressing a digit or setting the scale parameter will zoom to the center of the map.  If you want a submap of a different location, you have to specify the x/y coordinates as a URL parameter as well.
+
+For testing, it may be easier to keep loading the same .map file automatically.  First save the map as a .map file, then save it to the browser console (F6).
+Under Options, select "Open last saved map" under "Onload behaviour".
+
+
+To repeatedly choose the same area, use the map URL parameters:
+
+https://goteguru.github.io/Fantasy-Map-Generator/?scale=5
+
+If you have a x/y position other than the centre, use:
+
+https://goteguru.github.io/Fantasy-Map-Generator/?scale=5&x=100&y=200
+where 100 and 200 are your x/y position to zoom to.
+
+Once you have the area and zoom correct, load your map, go to Tools, and click Submap at the bottom.
+
+If it gives any problems, please copy/paste any errors from the browser console (F12, console tab), and also give the .map file and a description of the error and the URL parameters you used.