Add Franzininho WiFi Board (platformio#642)

Author: arcostasi

boards/esp32-s2-franzininho.json

@@ -0,0 +1,32 @@
+{
+  "build": {
+    "arduino":{
+      "ld": "esp32s2_out.ld"
+    },
+    "core": "esp32",
+    "f_cpu": "240000000L",
+    "f_flash": "80000000L",
+    "flash_mode": "dio",
+    "mcu": "esp32s2",
+    "variant": "esp32s2"
+  },
+  "connectivity": [
+    "wifi"
+  ],
+  "debug": {
+    "openocd_target": "esp32s2.cfg"
+  },
+  "frameworks": [
+    "espidf"
+  ],
+  "name": "Franzininho WiFi Board",
+  "upload": {
+    "flash_size": "4MB",
+    "maximum_ram_size": 327680,
+    "maximum_size": 4194304,
+    "require_upload_port": true,
+    "speed": 460800
+  },
+  "url": "https://github.com/Franzininho/Franzininho-WIFI",
+  "vendor": "Franzininho"
+}