Create package.json

Allows for easy platform.io platform_packages to be used. See https://community.platformio.org/t/upgrading-individual-platform-packages/31731/4

megaavr/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "framework-arduino-megaavr-megatinycore",
+  "version": "2.6.10",
+  "description": "Arduino Wiring-based Framework for Microchip tinyAVR 0-series and 1-series chips (megaTinyCore)",
+  "keywords": [
+    "framework",
+    "arduino",
+    "microchip",
+    "tinyAVR"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/SpenceKonde/megaTinyCore"
+  }
+}