Implement plugin

README.md

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+# ckeditor5-math
+
+## Supported input and output formats
+- <script type="math/tex">\sqrt{\frac{a}{b}}</script>
+- <script type="math/tex; mode=display">\sqrt{\frac{a}{b}}</script>
+- <span class="math-tex">\( \sqrt{\frac{a}{b}} \)</span>
+- <span class="math-tex">\[ \sqrt{\frac{a}{b}} \]</span>
+
+## Styles
+- Styles requires PostCSS