Add NodeMCU-32S2 board (platformio#902)

Author: sonidelav

boards/nodemcu-32s2.json

@@ -0,0 +1,34 @@
+{
+  "build": {
+    "arduino": {
+      "ldscript": "esp32s2_out.ld"
+    },
+    "core": "esp32",
+    "extra_flags": "-DARDUINO_ESP32S2_DEV",
+    "f_cpu": "240000000L",
+    "f_flash": "80000000L",
+    "flash_mode": "qio",
+    "mcu": "esp32s2",
+    "variant": "esp32s2"
+  },
+  "connectivity": [
+    "wifi"
+  ],
+  "debug": {
+    "openocd_target": "esp32s2.cfg"
+  },
+  "frameworks": [
+    "arduino",
+    "espidf"
+  ],
+  "name": "Ai-Thinker NodeMCU-32S2 (ESP-12K)",
+  "upload": {
+    "flash_size": "4MB",
+    "maximum_ram_size": 327680,
+    "maximum_size": 4194304,
+    "require_upload_port": true,
+    "speed": 460800
+  },
+  "url": "https://docs.ai-thinker.com/en/esp32s2",
+  "vendor": "Ai-Thinker"
+}