Extend native SDK descriptions

(cherry picked from commit 8a07ebe)

Author: valeros

platform.json

@@ -31,11 +31,17 @@
     },
     "esp8266-rtos-sdk": {
       "package": "framework-esp8266-rtos-sdk",
-      "script": "builder/frameworks/esp8266-rtos-sdk.py"
+      "script": "builder/frameworks/esp8266-rtos-sdk.py",
+      "description": "ESP8266 SDK based on FreeRTOS, a truly free professional grade RTOS for microcontrollers",
+      "url": "https://github.com/espressif/ESP8266_RTOS_SDK",
+      "title": "ESP8266 RTOS SDK"
     },
     "esp8266-nonos-sdk": {
       "package": "framework-esp8266-nonos-sdk",
-      "script": "builder/frameworks/esp8266-nonos-sdk.py"
+      "script": "builder/frameworks/esp8266-nonos-sdk.py",
+      "description": "The non-OS SDK provides a set of application programming interfaces (APIs) for core ESP8266 functionalities such as data reception/transmission over Wi-Fi, TCP/IP stack functions, hardware interface functions and basic system management functions",
+      "url": "https://github.com/espressif/ESP8266_NONOS_SDK",
+      "title": "ESP8266 Non-OS SDK"
     }
   },
   "packages": {