Add .editorconfig, .gitignore, and .vscode/extensions.json files

Author: MicLieg

.editorconfig

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+# EditorConfig helps developers define and maintain consistent coding styles between different editors and IDEs.
+# Atom: Please assure your Atom's config setting Tab Type is set to auto, otherwise Atom-EditorConfig may not work as expected. Also disable whitespace package.
+# http://editorconfig.org/
+
+root = true
+
+[*]
+charset = utf-8
+indent_style = tab
+indent_size = 4
+trim_trailing_whitespace = true
+end_of_line = lf
+insert_final_newline = true
+
+# MARKDOWN Files
+[*.{md}]
+indent_style = space
+indent_size = 4

.gitignore

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+.vscode/settings.json

.markdownlint.json

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+{
+	"MD013": false,
+	"MD030": {
+	  "ul_single": 3,
+	  "ol_single": 1,
+	  "ul_multi": 3,
+	  "ol_multi": 1
+	}
+  }

.vscode/extensions.json

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+{
+  "recommendations": [
+    "editorconfig.editorconfig",
+    "yzhang.markdown-all-in-one",
+    "DavidAnson.vscode-markdownlint",
+    "esbenp.prettier-vscode"
+  ]
+}