Adding ?<Markdown_Link> (Fixes #117)

RegEx/Markdown/Link.regex.ps1

@@ -0,0 +1,26 @@
+<#
+.SYNOPSIS
+    Matches a Markdown Link
+.DESCRIPTION
+    Matches a Markdown Link.  Can customize the link text and link url.
+.NOTES
+    This only matches simple markdown links.  It does not currently match links with titles.
+#>
+param(
+# The text of the link.
+$LinkText  = '[^\]\r\n]+',
+
+# The link URI.
+[Alias('LinkUrl')]
+$LinkUri   = '[^\)\r\n]+'
+)
+
+@"
+(?<IsImage>\!)?    # If there is an exclamation point, then it is an image link
+\[                 # Markdown links start with a bracket 
+(?<Text>$LinkText)
+\]                 # anything until the end bracket is the link text.
+\(                 # The link uri is within parenthesis
+(?<Uri>$LinkUri)
+\)                 # anything until the closing parenthesis is the link uri.
+"@