primeiro commit com exercicios de Exercism realizados até esta data

dart/hello-world/.exercism/config.json

@@ -0,0 +1,26 @@
+{
+  "authors": [
+    "SuperPaintman"
+  ],
+  "contributors": [
+    "rafaelalvessa",
+    "Stargator"
+  ],
+  "files": {
+    "solution": [
+      "lib/hello_world.dart"
+    ],
+    "test": [
+      "test/hello_world_test.dart"
+    ],
+    "example": [
+      ".meta/lib/example.dart"
+    ],
+    "invalidator": [
+      "pubspec.yaml"
+    ]
+  },
+  "blurb": "Exercism's classic introductory exercise. Just say \"Hello, World!\".",
+  "source": "This is an exercise to introduce users to using Exercism",
+  "source_url": "https://en.wikipedia.org/wiki/%22Hello,_world!%22_program"
+}

dart/hello-world/.exercism/metadata.json

@@ -0,0 +1 @@
+{"track":"dart","exercise":"hello-world","id":"3416a5e62e344dd3ab25a1455c84721e","url":"https://exercism.org/tracks/dart/exercises/hello-world","handle":"sanctushck","is_requester":true,"auto_approve":false}