Add editor & markdown-linter configs

.editorconfig

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+# Check http://editorconfig.org for more information
+# This is the main config file for this project:
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true
+
+[*.py]
+indent_style = space
+indent_size = 4
+
+[*.md]
+trim_trailing_whitespace = false

.markdownlint.jsonc

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+/*
+Configuration file for VSCode-markdownlint extension,
+see https://github.com/DavidAnson/vscode-markdownlint#configure
+
+For how the rules can be configured,
+see https://github.com/DavidAnson/markdownlint/blob/v0.35.0/schema/.markdownlint.jsonc
+*/
+{
+  "default": true,
+  "MD013": {
+    "line_length": 160  // Allow longer lines
+  },
+  "MD033": {
+    "allowed_elements": ["img"]  // Allow inline images
+  },
+  "MD034": false, // No bare URLs
+}