HACKING.md: New file with some notes in

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

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+# Hacking on hippotat
+
+(This file is not very comprehensive.)
+
+## Testing
+
+Using upstream dependencies
+
+```
+NAILING_CARGO=nailing-cargo make check
+```
+
+Using dependencies from Debian
+
+```
+autopkgtest --ignore-restrictions=x-hippotat-adt-broken-in-debci . --- schroot build
+```