Add prettier configuration

thrimbletrimmer/beta/.prettierignore

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+videojs/

thrimbletrimmer/beta/.prettierrc.yaml

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+# Config for auto-formatting of our JS files using prettier
+# https://prettier.io/docs/en/configuration.html
+
+# This is NOT a length limit but a hint to the auto-formatter for how long lines should try to be.
+printWidth: 100
+# Use tabs for indentation, spaces for alignment
+useTabs: true