feat(markdown): Add markdownlint config

Signed-off-by: txtsd <thexerothermicsclerodermoid@gmail.com>

.markdownlint.yaml

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+# MD013/line-length - Line length
+MD013: false
+
+# MD024/no-duplicate-heading/no-duplicate-header - Multiple headings with the same content
+MD024:
+  siblings-only: true
+
+# MD033/no-inline-html Inline HTML
+MD033: false
+
+# MD041/first-line-heading/first-line-h1 First line in a file should be a top-level heading
+MD041: false

.markdownlintignore

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+libraries/nbtplusplus
+libraries/quazip