Add Git and VSCode settings

.gitattributes

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+# Normalize line endings to LF for all files considered text by Git
+* text=auto eol=lf
+
+# Never perform LF normalization on these files
+*.ico    binary
+*.jar    binary
+*.png    binary
+*.zip    binary

.vscode/extensions.json

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+{
+  "recommendations": [
+    "dart-code.dart-code",
+    "dart-code.flutter",
+    "mhutchie.git-graph",
+    "nhoizey.gremlins"
+  ]
+}

.vscode/settings.json

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+{
+  "files.eol": "\n",
+  "editor.rulers": [
+    80,100,120
+  ],
+  "dart.lineLength": 100,
+  "editor.tabSize": 2,
+}