Add some explanations in the README

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-# freefit (also known as: FereFit, Lyne_Wearables, HomieFit, zwsvibe, WIRCASS)
+# zwzn-freefit-re
 
 Reverse-engineering a sketchy Chinese watch app
 
 Documentation/protocols derived from decompiled FereFit Android app (jadx)  
 (com.czw.freefit, SHENZHEN ZHONGWEI INTELLIGENT TECHNOLOGY Co.,Ltd)
 
+## What this is and why it exists
+
+This is a git repo containing protocol documentation of the `freefit` watch app, commonly known as "FereFit", "Lyne_Wearables", "HomieFit", "zwsvibe", and "WIRCASS". It allows us to make our own app implementations for some watches that use these apps. In particular, my testing occurs with the "Watch ULTRA", which I cannot find any more brand information on, though it's a sort of no-name Apple Watch ULTRA knockoff. Although, this protocol should work fine for most other watches that use these apps.
+
+This exists for many reasons, though here are the top few:
+
+- I'm 13 and have too much free time
+- I wanted to get into reverse-engineering 
+- I had an old knockoff "Watch ULTRA" from the arcade, and the original app was spyware
+- The RTC on this watch drifts badly, so without an app to periodically synchronize it, it becomes almost unusable 
+
+Anyway, talk is cheap, let's get into the documentation!
+
 ## BLE characteristics
 
 ### Main characteristics (presumably Nordic UART/Nordic semiconductor chips)