Update dropped changes from sample directory restructure (Azure#985)

* PnP to IoT Plug and Play in README.md
* Add LNK4098 workaround into CMakeList.txt

sdk/samples/iot/CMakeLists.txt

@@ -133,4 +133,20 @@ target_link_libraries(paho_iot_provisioning_sas_sample
     az::iot::samples::common
 )
 
-endif() # TRANSPORT_PAHO
+# Workaround for linker warning LNK4098: defaultlib 'LIBCMTD' conflicts with use of other libs
+if (MSVC)
+    set_target_properties(
+        paho_iot_hub_c2d_sample
+        paho_iot_hub_methods_sample
+        paho_iot_hub_pnp_sample
+        paho_iot_hub_telemetry_sample
+        paho_iot_hub_sas_telemetry_sample
+        paho_iot_hub_twin_sample
+        paho_iot_provisioning_sample
+        paho_iot_provisioning_sas_sample
+        PROPERTIES LINK_FLAGS
+        "/NODEFAULTLIB:libcmtd.lib"
+    )
+endif()
+
+endif() # TRANSPORT_PAHO