Initial commit

Signed-off-by: Thomas Klaehn <thomas.klaehn@perinet.io>

example/testdata/README.md

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+# Test Data
+
+This directory contains example FIT files for testing and demonstration purposes.
+
+## Files
+
+- **Activity.fit** (92 KB) - Full activity file from Garmin SDK with 3,601 data records
+- **Settings.fit** (82 bytes) - Simple settings file
+- **MonitoringFile.fit** (2.1 KB) - Daily monitoring data example
+- **WorkoutIndividualSteps.fit** (175 bytes) - Workout definition file
+- **RealWorld_Cycling.fit** (171 KB) - Real-world cycling activity from Wahoo ELEMNT device
+
+## Usage
+
+```go
+package main
+
+import (
+    "log"
+    "os"
+    "git.blackfinn.de/go/fit-parser/fitparser"
+)
+
+func main() {
+    data, _ := os.ReadFile("testdata/Activity.fit")
+    decoder, _ := fitparser.NewDecoder(data)
+    messages, err := decoder.Decode()
+    if err != nil {
+        log.Fatal(err)
+    }
+    // Process messages...
+}
+```
+
+## Source
+
+- SDK examples: From official Garmin FIT SDK (https://developer.garmin.com/fit/)
+- Real-world example: Wahoo ELEMNT cycling device
+
+## License
+
+These files are provided for testing and educational purposes. The FIT protocol and SDK are property of Garmin International, Inc.