Add markdown format support (#25)

Co-authored-by: Dawid Dziurla <dawidd0811@gmail.com>

node_modules/showdown/test/features/literalMidWordAsterisks/#478.single-character-bolding.html

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+<p>Click the <strong>X</strong></p>
+<p>Click the <strong>X</strong> button and then the <strong>OK</strong> button</p>

node_modules/showdown/test/features/literalMidWordAsterisks/#478.single-character-bolding.md

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+Click the **X**
+
+Click the **X** button and then the **OK** button

node_modules/showdown/test/features/literalMidWordAsterisks/basic.html

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+<p>this is a sentence*with*mid asterisks</p>
+<p>this is a sentence**with**two mid asterisks</p>
+<p>this is a sentence***with***three mid asterisks</p>
+<p>this is double*asterisk*mid word with another**asterisk**word</p>
+<p>this is double**asterisk**mid word with another**asterisk**word</p>
+<p>this is double***asterisk***mid word with another***asterisk***word</p>
+<p>this is double*asterisk**mid word with another***asterisk*word</p>
+<p>this is double**asterisk*mid word with another***asterisk**word</p>
+<p>this is a sentence with just*one asterisk</p>
+<p>this is a sentence with just**one asterisk</p>
+<p>this is a sentence with just***one asterisk</p>
+<p>this is double**asterisk**mid word</p>
+<p>this has just**one double asterisk</p>
+<p>this has just***one triple asterisk</p>
+<p>this <em>should be parsed</em> as emphasis</p>
+<p>this <strong>should be parsed</strong> as bold</p>
+<p>this <strong><em>should be parsed</em></strong> as bold and emphasis</p>
+<p>emphasis at <em>end of sentence</em></p>
+<p>bold at <strong>end of sentence</strong></p>
+<p>bold and emphasis at <strong><em>end of sentence</em></strong></p>
+<p><em>emphasis at</em> line start</p>
+<p><strong>bold at</strong> line start</p>
+<p><strong><em>bold and emphasis at</em></strong> line start</p>
+<p>multi <em>line emphasis
+yeah it is</em> yeah</p>
+<p>multi <strong>line emphasis
+yeah it is</strong> yeah</p>
+<p>multi <strong><em>line emphasis
+yeah it is</em></strong> yeah</p>

node_modules/showdown/test/features/literalMidWordAsterisks/basic.md

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+this is a sentence*with*mid asterisks
+
+this is a sentence**with**two mid asterisks
+
+this is a sentence***with***three mid asterisks
+
+this is double*asterisk*mid word with another**asterisk**word
+
+this is double**asterisk**mid word with another**asterisk**word
+
+this is double***asterisk***mid word with another***asterisk***word
+
+this is double*asterisk**mid word with another***asterisk*word
+
+this is double**asterisk*mid word with another***asterisk**word
+
+this is a sentence with just*one asterisk
+
+this is a sentence with just**one asterisk
+
+this is a sentence with just***one asterisk
+
+this is double**asterisk**mid word
+
+this has just**one double asterisk
+
+this has just***one triple asterisk
+
+this *should be parsed* as emphasis
+
+this **should be parsed** as bold
+
+this ***should be parsed*** as bold and emphasis
+
+emphasis at *end of sentence*
+
+bold at **end of sentence**
+
+bold and emphasis at ***end of sentence***
+
+*emphasis at* line start
+
+**bold at** line start
+
+***bold and emphasis at*** line start
+
+multi *line emphasis
+yeah it is* yeah
+
+
+multi **line emphasis
+yeah it is** yeah
+
+
+multi ***line emphasis
+yeah it is*** yeah

node_modules/showdown/test/features/literalMidWordAsterisks/punctation-test.html

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+<p><strong>Bold:</strong></p>
+<p><strong>Bold</strong></p>
+<p><strong>Bold</strong>:</p>
+<ul>
+    <li><strong>Bold</strong><ul>
+        <li>Tier 2</li></ul></li>
+</ul>

node_modules/showdown/test/features/literalMidWordAsterisks/punctation-test.md

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+**Bold:**
+
+**Bold**
+
+**Bold**:
+
+- **Bold**
+    - Tier 2