Update docs.json

Add NFC docs.

Author: Amanda Butler

docs.json

@@ -430,6 +430,22 @@
                     }
                 ]
             },
+            {
+                "title": "NFC",
+                "intro": {
+                    "type": "markdown",
+                    "url": "https://github.com/ARMmbed/mbed-os-5-docs/blob/development/docs/reference/api/connectivity/nfc/NDEF.md"
+                },
+                "sources": [{
+                        "type": "markdown",
+                        "url": "https://github.com/ARMmbed/mbed-os-5-docs/blob/development/docs/reference/api/connectivity/nfc/NFCController.md"
+                    },
+                    {
+                        "type": "markdown",
+                        "url": "https://github.com/ARMmbed/mbed-os-5-docs/blob/development/docs/reference/api/connectivity/nfc/NFCEEPROM.md"
+                    }
+                ]
+            },       
             {
                 "title": "Security",
                 "intro": {
@@ -586,6 +602,10 @@
                         "type": "markdown",
                         "url": "https://github.com/ARMmbed/mbed-os-5-docs/blob/development/docs/reference/technology/connectivity/lora-tech.md"
                     },
+                    {
+                        "type": "markdown",
+                        "url": "https://github.com/ARMmbed/mbed-os-5-docs/blob/development/docs/reference/technology/connectivity/NFC.md"
+                    },      
                     {
                         "type": "markdown",
                         "url": "https://github.com/ARMmbed/mbed-os-5-docs/blob/development/docs/reference/runtime/Bootstrap.md"