Added a new app idea: math editor for students

Projects/2-Intermediate/math-editor.md

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+# Math Formula Editor
+
+**Tier:** 2-Intermediate
+
+An app (desktop or web) which you can use to edit different kinds of math formulas. The app will be particularry useful for doing your math homework digitally.
+
+The app will probably use a math markup system such as LaTeX.
+
+## User Stories
+
+-   [ ] User can write to a text document
+-   [ ] User can add a math formula to that text document
+-   [ ] User can save the document either to a database or as a file locally
+-   [ ] User can load the file and all the formulas should be still intact
+
+## Bonus features
+
+-   [ ] User can change the font size of text
+-   [ ] User can change other attributes of text (color, bold, etc.)
+-   [ ] User can add images to the document
+
+## Useful links and resources
+
+-   [Mathquill](http://mathquill.com/)
+
+## Example projects
+
+-   [L'math, a math editor for finnish high school students, change the language on the top left corner](https://www.lehtodigital.fi/lmath/?p=download)
+-   [Online demo of a simple math editor](https://math-demo.abitti.fi)