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52f74a32 - Add gitattributes file

Add gitattributes file With two configurations: 1. `* text=auto`: normalizes line endings for all files in the repo 2. `FILE -diff`: hides the diff of these files by default. I configured this for lib/main.js and package-lock.json as they are not (intended to be) human readable nor edited by humans. Hence, seeing their diff is mostly useless.