Add MathJax example post

exampleSite/content/post/mathjax.md

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+---
+title: MathJax
+description: Simple MathJax example test article
+date: 2019-01-13
+mathjax: true
+tags:
+  - "MathJax"
+---
+
+MathJax JavaScript library allows you to include mathematics in your web pages for viewing in any modern browser.
+<!--more-->
+
+## How to enable MathJax
+
+For enabling MathJax, add this to your content's frontmatter:
+
+```yaml
+mathjax: true
+```
+
+## MathJax example
+
+**Input**:
+
+```
+When \\( a \ne 0 \\), there are two solutions to
+
+$$ ax^2 + bx + c = 0 $$
+
+and they are:
+
+\\[ x = {-b \pm \sqrt{b^2-4ac} \over 2a} \\]
+```
+
+**Output**:
+
+When \\( a \ne 0 \\), there are two solutions to
+
+$$ ax^2 + bx + c = 0 $$
+
+and they are:
+
+\\[ x = {-b \pm \sqrt{b^2-4ac} \over 2a} \\]