initiated venv, installed FreeSimpleGUI and PySerial

.venv/bin/pip3

@@ -0,0 +1,8 @@
+#!/home/feda/MIPT/RadioPhotonic_Subserface_radar/Generator_PCB/Python_GUI/.venv/bin/python
+# -*- coding: utf-8 -*-
+import re
+import sys
+from pip._internal.cli.main import main
+if __name__ == '__main__':
+    sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])
+    sys.exit(main())