feat: add Modbus support

lib/eModbus/library.json

@@ -0,0 +1,46 @@
+{
+  "name": "eModbus",
+  "version": "1.7.0",
+  "keywords": "Arduino, ESP32, Modbus, RTU, ASCII, ModbusASCII, ModbusRTU, ModbusTCP",
+  "description": "ModbusRTU, ModbusASCII and ModbusTCP functions for ESP32",
+  "homepage": "https://emodbus.github.io",
+  "license": "MIT",
+  "authors": [
+    {
+      "name": "Bert Melis",
+      "url": "https://github.com/bertmelis",
+      "maintainer": true
+    },
+    {
+      "name": "Michael Harwerth",
+      "url": "https://github.com/Miq1",
+      "email": "miq1@gmx.de",
+      "maintainer": true
+    }
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/eModbus/eModbus",
+    "branch": "master"
+  },
+  "export": {
+    "include":
+    [
+        "src/*.cpp",
+        "src/*.h",
+        "examples/*",
+        "Test/*",
+        ".gitignore",
+        "README.md",
+        "license.md",
+        "keywords.txt",
+        "library.properties",
+        "library.json"
+    ]
+  },
+  "frameworks": "arduino",
+  "platforms": [
+    "espressif32",
+    "espressif8266"
+  ]
+}