Add mutf8 (Modified UTF-8) package (#2802)

packages.json

@@ -1,4 +1,25 @@
 [
+  {
+    "name": "mutf8",
+    "url": "https://github.com/Nimberite-Development/ModernNet",
+    "method": "git",
+    "tags": [
+      "encoding",
+      "decoding",
+      "encode",
+      "decode",
+      "chartset",
+      "mutf8",
+      "mutf-8",
+      "utf8",
+      "utf-8",
+      "unicode"
+    ],
+    "description": "An implementation of a Modified UTF-8 encoder and decoder in Nim!",
+    "license": "Apache-2.0",
+    "web": "https://github.com/Yu-Vitaqua-fer-Chronos/MUTF-8",
+    "doc": "https://yu-vitaqua-fer-chronos.github.io/MUTF-8/"
+  },
   {
     "name": "dekao",
     "url": "https://github.com/ajusa/dekao",