Addressed issues pointed out by Markdownlint

Added Markdownlint configuration disabling a set of rules

- "first-line-h1": MD041 - First line in file should be a top level heading, ref: https://github.com/DavidAnson/markdownlint/blob/master/doc/Rules.md#md041---first-line-in-file-should-be-a-top-level-heading
- "no-duplicate-heading": MD024 - Multiple headings with the same content, ref: https://github.com/DavidAnson/markdownlint/blob/master/doc/Rules.md#md024---multiple-headings-with-the-same-content
- "html": MD033 - Inline HTML, ref: https://github.com/DavidAnson/markdownlint/blob/master/doc/Rules.md#md033---inline-html
- "line-length": MD013 - Line length, ref: https://github.com/DavidAnson/markdownlint/blob/master/doc/Rules.md#md013---line-length
- "blanks-around-headings": MD022 - Headings should be surrounded by blank lines, ref: https://github.com/DavidAnson/markdownlint/blob/master/doc/Rules.md#md022---headings-should-be-surrounded-by-blank-lines

.markdownlint.json

@@ -0,0 +1,7 @@
+{
+    "first-line-h1": false,
+    "no-duplicate-heading": false,
+    "html": false,
+    "line-length": false,
+    "blanks-around-headings": false
+}