feat: openEmbedding.get_Markdown ( Fixes #14 )

Only linking an image if we have an image

Author: James Brundage

Types/openEmbedding/get_Markdown.ps1

@@ -1 +1,6 @@
-"[![$($this.title)]($($this.thumbnail_url))]($($this.url))"
+if ($this.thumbnail_url) {
+    return "[![$($this.title)]($($this.thumbnail_url))]($($this.url))"
+}
+elseif ($this.title) {
+    "[$($this.title)]($($this.url))"
+}