WiFi example application for LPC55S69 with ESP8266 shield/module

Revision:
0:2f4d849e36e5
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed_app.json	Mon Mar 25 22:50:52 2019 -0500
@@ -0,0 +1,25 @@
+{
+    "config": {
+        "wifi-ssid": {
+            "help": "WiFi SSID",
+            "value": "\"SSID\""
+        },
+        "wifi-password": {
+            "help": "WiFi Password",
+            "value": "\"PASSWORD\""
+        }
+    },
+    "target_overrides": {
+        "*": {
+            "platform.stdio-convert-newlines": true
+        },
+        "LPC55S69": {
+            "target.network-default-interface-type" : "WIFI",
+            "esp8266.tx"                        : "D1",
+            "esp8266.rx"                        : "D0",
+            "esp8266.provide-default"           : true,
+            "drivers.uart-serial-rxbuf-size"    : 1024,
+            "drivers.uart-serial-txbuf-size"    : 1024
+          }
+    }      
+}