Initial windows runtime work

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

content/store_unix.go

@@ -0,0 +1,17 @@
+// +build linux
+
+package content
+
+import (
+	"os"
+	"syscall"
+	"time"
+)
+
+func getStartTime(fi os.FileInfo) time.Time {
+	if st, ok := fi.Sys().(*syscall.Stat_t); ok {
+		return time.Unix(st.Ctim.Sec, st.Ctim.Nsec)
+	}
+
+	return fi.ModTime()
+}