feat: Add core rules

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+<h2>LEVELS AND RANKS</h2>
+<p>Use levels and ranks as "sliders" to adjust the challenge posed by a battle.</p>
+<p>Example: When designing a battle involving three level 10 Player Characters, two level 10 soldiers would make for an extremely easy encounter, while a level 20 champion replacing four soldiers would be feasible but particularly challenging. Anything between those two extremes would be fair game — with a battle against three level 15 soldiers being the most “average” option.</p>
+<h2>IDEAL LENGTH</h2>
+<p>In Fabula Ultima, a conflict should ideally last three to four rounds. Keep this in mind when you design your battles.</p>
+<p>If you want to think in terms of damage, this means that on average, a successful enemy attack should do damage equal to one third of an average Player Character's Hit Points. Similarly, a PC's average attack should do damage equal to one third of an average soldier-rank enemy's Hit Points.</p>
+<h2>DAMAGE TYPES</h2>
+<p>When designing a battle, consider what types of damage the group has access to:</p>
+<ul>
+<li>Combine adversaries with different Vulnerabilities and Resistances.</li>
+<li>Grant powerful adversaries the ability to alter their Vulnerabilities and Resistances.</li>
+<li>If a creature has a Vulnerability that two or more characters in the group can exploit, balance this out by enhancing their Defense, Magic Defense, or Hit Points.</li>
+<li>If a creature has a large amount of Hit Points (as champions often do), give them at least one Vulnerability that the party can use to their advantage.</li>
+</ul>
+<p>Make it so that Player Characters cannot simply apply the same highest-damage option over and over during battles — that can get boring fast.</p>
+<p>Philip Forlenza (Order #)</p>