lab1: implement UART reader alongside with the file writer usage example

agent/uart-saver/FileWriter.py

@@ -0,0 +1,16 @@
+from UARTReader import UARTReader
+import os
+
+PORT = os.environ.get("PORT", None) or "/dev/ttyUSB0"
+FILE = os.environ.get("FILE", None) or "savefile.csv"
+
+r = UARTReader(PORT)
+
+with open(FILE, "w") as f:
+    f.write("x,y,z\n")
+
+    for i in range(500):
+        v = r.read_next()
+        f.write(",".join(tuple(map(str, v))) + "\n")
+
+r.close()