docs: update README.md (#150)

README.md

@@ -5,6 +5,8 @@
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 The Flexible and Interoperable Data Transfer (FIT) protocol is a protocol developed by Garmin for storing and sharing data originating from sports, fitness, and health devices.
 When recording an activity using devices such as cycling computer, smartwatch, and similar devices, chances are the resulting file is often in FIT file format (\*.fit).