add mardkownlint config (demisto#26974)

* add mdlint

* Update .markdownlint.json

Co-authored-by: Judah Schwartz <[email protected]>

---------

Co-authored-by: Judah Schwartz <[email protected]>

Author: ilaner

.markdownlint.json

@@ -0,0 +1,11 @@
+{
+    "default": true,
+    "whitespace" : false,
+    "single-trailing-newline" : false,
+    "no-trailing-punctuation" : false,
+    "first-line-h1" : false,
+    "heading-increment" : false,
+    "line_length" : false,
+    "no-duplicate-heading" : false,
+    "ol-prefix" : false
+}