docs: Add QA testing checklist

TESTING.md

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+# Testing
+
+This document provides a regression testing checklist for COSMIC Edit. The checklist provides a starting point for Quality Assurance reviews.
+
+## Checklist:
+
+### Basic operations
+
+- [ ] Type three lines of text (no trailing newline).
+- [ ] Copy the last two lines.
+- [ ] Paste at the end of the third line (file should now have four lines).
+- [ ] Ctrl-Z to undo the paste.
+- [ ] Press Enter to add a trailing newline.
+- [ ] Paste again (file should now have five lines).
+- [ ] Ctrl-Z to undo the paste.
+- [ ] Ctrl-Shift-Z to redo the paste.
+- [ ] Save the file.
+- [ ] Ctrl-F and search for something that has a match.
+- [ ] Press Esc twice to exit the Find dialog.
+- [ ] Press Ctrl-X to cut the selected search result.
+- [ ] Paste the cut text on a new line (file should now have six lines).
+- [ ] Re-save the file.
+- [ ] Narrow the window until the lines start wrapping (make a line longer if necessary to observe line wrapping).
+- [ ] Turn word wrapping off.
+- [ ] Scroll right to the end of the document, then left to the beginning again.
+- [ ] Click and drag to select some text past the horizontal edge of the window.
+- [ ] Close the file, open COSMIC Edit again, and open the file via the recents list.
+- [ ] Close the file again, open COSMIC Edit again, and open the file via the Open dialog.
+- [ ] Turn word wrapping back on.
+
+### Settings
+
+- [ ] Open View -> Settings.
+- [ ] All Appearance settings work.
+- [ ] Vim bindings work.
+
+### Projects & Git Management
+
+- [ ] Clone the cosmic-edit Git repo and open its directory as a project.
+- [ ] Edit -> Find in project... works.
+- [ ] Make a change in a file.
+- [ ] File -> Git management shows the change and staging it works.
+- [ ] Make another change while Git management's open; it updates to show the new change.