markdownlint, prettier: enable formatting

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I3f1eb4fd602cf9f6403836e554ad6d6f6e76f9db
diff --git a/.markdownlint.yaml b/.markdownlint.yaml
new file mode 100644
index 0000000..f5cfbee
--- /dev/null
+++ b/.markdownlint.yaml
@@ -0,0 +1,5 @@
+default: true
+MD024:
+    siblings_only: true
+MD013:
+    stern: true