Word table cell paragraph add image fix

[tmheath]

This pull request contains an untested fix for enabling a paragraph created by WordTableCell to add an image automatically by adding the argument for the document reference to the called constructed for WordParagraph to pass the WordTableCell's _document attribute.

• Adds example for Images in Table
• Adds additional testing for adding paragraph in table and attaching image to it

closes #174

[PrzemyslawKlys]

I've modified your PR a bit. It seems to work fine. Keep in mind it's not necessary to add paragraph in empty table, as it already has at least one paragraph present.

internal static void Example_AddingImagesSampleToTable(string folderPath, bool openWord) {
    Console.WriteLine("[*] Creating standard document with some Images and Samples");
    var filePath = System.IO.Path.Combine(folderPath, "BasicDocumentWithImagesSample4.docx");
    var imagePaths = System.IO.Path.Combine(System.IO.Directory.GetCurrentDirectory(), "Images");

    using var document = WordDocument.Create(filePath);

    var table = document.AddTable(2, 2);
    table.Rows[0].Cells[0].Paragraphs[0].AddImage(System.IO.Path.Combine(imagePaths, "PrzemyslawKlysAndKulkozaurr.jpg"), 200, 200);

    // not really nessessary to add new paragraph since one is already there by default
    var paragraph = table.Rows[0].Cells[1].AddParagraph();
    paragraph.AddImage(System.IO.Path.Combine(imagePaths, "PrzemyslawKlysAndKulkozaurr.jpg"), 200, 200);

    document.AddHeadersAndFooters();

    var tableInHeader = document.Header.Default.AddTable(2, 2);
    tableInHeader.Rows[0].Cells[0].Paragraphs[0].AddImage(System.IO.Path.Combine(imagePaths, "PrzemyslawKlysAndKulkozaurr.jpg"), 200, 200);

    // not really nessessary to add new paragraph since one is already there by default
    var paragraphInHeader = tableInHeader.Rows[0].Cells[1].AddParagraph();
    paragraphInHeader.AddImage(System.IO.Path.Combine(imagePaths, "PrzemyslawKlysAndKulkozaurr.jpg"), 200, 200);

    document.Save(openWord);
}

[tmheath]

Thanks