ports: Add board.json for all boards.

This will be used by https://micropython.org/download/ to generate the
full listing of boards and firmware files.

Optionally supports a board.md for additional customisation of the
download page, as well as deploy.md for flashing instructions.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

ports/samd/boards/ADAFRUIT_FEATHER_M0_EXPRESS/board.json

@@ -0,0 +1,15 @@
+{
+    "deploy": [
+        "../deploy.md"
+    ],
+    "docs": "",
+    "features": [],
+    "images": [
+        "feather_m0_express.jpg"
+    ],
+    "mcu": "samd21",
+    "product": "Feather M0 Express",
+    "thumbnail": "",
+    "url": "https://www.adafruit.com/product/3403",
+    "vendor": "Adafruit"
+}

ports/samd/boards/ADAFRUIT_ITSYBITSY_M4_EXPRESS/board.json

@@ -0,0 +1,15 @@
+{
+    "deploy": [
+        "../deploy.md"
+    ],
+    "docs": "",
+    "features": [],
+    "images": [
+        "itsybitsy_m4_express.jpg"
+    ],
+    "mcu": "samd51",
+    "product": "ItsyBitsy M4 Express",
+    "thumbnail": "",
+    "url": "https://www.adafruit.com/product/3800",
+    "vendor": "Adafruit"
+}

ports/samd/boards/ADAFRUIT_TRINKET_M0/board.json

@@ -0,0 +1,15 @@
+{
+    "deploy": [
+        "../deploy.md"
+    ],
+    "docs": "",
+    "features": [],
+    "images": [
+        "trinket_m0.jpg"
+    ],
+    "mcu": "samd21",
+    "product": "Trinket M0",
+    "thumbnail": "",
+    "url": "https://www.adafruit.com/product/3500",
+    "vendor": "Adafruit"
+}

ports/samd/boards/MINISAM_M4/board.json

@@ -0,0 +1,15 @@
+{
+    "deploy": [
+        "../deploy.md"
+    ],
+    "docs": "",
+    "features": [],
+    "images": [
+        "mini_sam_m4.jpg"
+    ],
+    "mcu": "samd51",
+    "product": "Mini SAM M4",
+    "thumbnail": "",
+    "url": "https://minifigboards.com/products/mini-sam-m4",
+    "vendor": "MiniFig Boards"
+}

ports/samd/boards/SAMD21_XPLAINED_PRO/board.json

@@ -0,0 +1,13 @@
+{
+    "deploy": [
+        "../deploy.md"
+    ],
+    "docs": "",
+    "features": [],
+    "images": ["2033-atsamd21-xpro.jpg"],
+    "mcu": "samd21",
+    "product": "SAMD21 Xplained Pro",
+    "thumbnail": "",
+    "url": "https://www.microchip.com/en-us/development-tool/atsamd21-xpro",
+    "vendor": "Microchip"
+}