Added player movement

server/game/String.go

@@ -0,0 +1,10 @@
+package game
+
+import "encoding/binary"
+
+// AppendString appends the length of the string followed by its contents.
+func AppendString(data []byte, str string) []byte {
+	data = binary.LittleEndian.AppendUint32(data, uint32(len(str)))
+	data = append(data, []byte(str)...)
+	return data
+}