Add math content; update QYF-XSS article (WIP)

_config.yml

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+plugins:
+  - jekyll-katex

_posts/2020-09-12-minesweeper.md

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+---
+title: "Minesweeper Bomb Generation And Tile Revealing"
+layout: post
+---
+
+When I was creating a little Minesweeper game, I got confused at some points.
+My bomb generation didn't look quite right, and I for sure didn't quite get the whole cascading tile reveal thing.
+With a bit of internet research, I found what I was looking for.
+I'll explain it all in one place for my own and others' purposes.
+
+### Bomb Generation
+
+When I started this project I attempted to use a random bomb generator.
+By this I mean on each square, before it gets generated, give it a one in 15 change of being a bomb.
+Personally, I'm not sure why this never looked right.
+Something about the layout of the bombs did not mimic the classic Minesweeper game.
+
+After looking at some open source Minesweeper examples, I found the following algorithms:
+
+* `X = R % W`
+* `Y = R // H`
+
+Where % is a [modulo] operator

math.md

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+---
+title: "Math Test"
+layout: default
+---
+
+<link rel="stylesheet" href="/assets/css/katex.css">
+
+{% katex display %}
+\pm\sqrt{a^2 + b^2}
+{% endkatex %}
+
+{% katex display %}
+a^2 + b^2 = c^2
+{% endkatex %}
+
+{% katex display %}
+\textcolor{blue} x = \frac{\textcolor{#47a}{-b\pm\sqrt{b^2-4ac}}}{2a}
+{% endkatex %}