Added basic nirfsg example

Author: Vaishnavigupta1312

src/nirfsg/examples/nirfsg_cw.py

@@ -0,0 +1,22 @@
+import nirfsg
+import numpy as np
+ 
+# RFSG session create
+options = "Simulate=1, DriverSetup=Model:5841"
+session  = nirfsg.Session(resource_name='PXI1Slot2', id_query=False, reset_device=False, options=options)
+# session = nirfsg.Session("5841", id_query=False, reset_device=False, options=options)
+ 
+# configure frequency to 1Ghz, power level to -10db and iq rate to 1M
+session.configure_rf(
+    1e9, # frequency
+    -10  # powerLevel
+    )
+#session.iq_rate = 1e6
+#session.generation_mode = nirfsg.GenerationMode.CW
+ 
+# Start generation
+with session.initiate():
+    # Generation context
+    input("Press Enter to stop generation")
+ 
+session.close()