Add directions to install Flatpak SDK per #126#133

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iancleary wants to merge 3 commits intoelementary:masterfrom iancleary:patch-1

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Commits on Sep 11, 2021

Added directions to install Flatpak SDK per elementary#126
Ian Cleary (he/him/his)
authored
Added .flatpak-builder to .gitignore
Ian Cleary (he/him/his)
authored
Added echo command to facilitate change
Ian Cleary (he/him/his)
authored