Housekeeping: add rules for markdownlint.

README.md

@@ -1,3 +1,14 @@
+<!-- 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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