Add support for ESP32 Pico Kit

boards/pico32.json

@@ -0,0 +1,36 @@
+{
+  "build": {
+    "core": "esp32",
+    "extra_flags": "-DARDUINO_ESP32_PICO",
+    "f_cpu": "240000000L",
+    "f_flash": "40000000L",
+    "flash_mode": "dio",
+    "ldscript": "esp32_out.ld",
+    "mcu": "esp32",
+    "variant": "pico32"
+  },
+  "connectivity": [
+    "wifi",
+    "bluetooth",
+    "ethernet",
+    "can"
+  ],
+  "frameworks":  [
+    "arduino",
+    "espidf"
+  ],
+  "name": "ESP32 Pico Kit",
+  "upload": {
+    "flash_size": "4MB",
+    "maximum_ram_size": 294912,
+    "maximum_size": 1310720,
+    "require_upload_port": true,
+    "speed": 115200,
+    "protocol": "esptool",
+    "protocols": [
+      "esptool"
+    ]
+  },
+  "url": "http://esp-idf.readthedocs.io/en/latest/get-started/get-started-pico-kit.html",
+  "vendor": "Espressif"
+}

platform.json

@@ -45,7 +45,7 @@
     "framework-arduinoespressif32": {
       "type": "framework",
       "optional": true,
-      "version": "~1.4.0"
+      "version": "~1.5.0"
     },
     "framework-espidf": {
       "type": "framework",