Testing markdown support

Tests:
* Support of Archive in Document creation
* Support of external / internal links

Author: JorjMcKie

tests/test_markdown_support.py

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+import pymupdf
+import pathlib
+
+
+def test_archive_markdown():
+    """Test Archive support."""
+    path = pathlib.Path().absolute() / "resources"
+    md = b"![](nur-ruhig.jpg)\n\n**A referenced image.**"
+    md_doc = pymupdf.open(stream=md, filetype="md", archive=path.name)
+    pdfdata = md_doc.convert_to_pdf()
+    doc = pymupdf.open(stream=pdfdata)
+    page = doc[0]
+    images = page.get_image_info()
+    assert len(images) == 1
+
+def test_archive_links():
+    """Create an internal and an external link and confirm
+    that they are correctly converted to PDF links."""
+    md = """Some text containing an external [link](http://www.google.com) to Google.
+    Now an internal link to a header in this document: [Some Header](#some-header). The header is here:
+
+    <h2 id="some-header">Some Header</h2>
+
+    Some text following the header.
+    """
+    md_doc = pymupdf.open(stream=md.encode(), filetype="md")
+    pdfdata = md_doc.convert_to_pdf()
+    doc = pymupdf.open(stream=pdfdata)
+    page = doc[0]
+    links=page.get_links()
+    assert len(links) == 2
+    assert links[0]["uri"] == "http://www.google.com"
+    assert links[0]["kind"] == pymupdf.LINK_URI
+    assert links[1]["kind"] == pymupdf.LINK_GOTO