Housekeeping: add markdownlint.json.

README.md

@@ -1,14 +1,3 @@
-<!-- markdownlint-configure-file
-{
-    "no-inline-html":false,
-    "first-line-h1":false,
-    "descriptive-link-text":false,
-    "no-blanks-blockquote":false,
-    "fenced-code-language":false,
-    "table-column-count":false
-}
--->
-
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