theory pages added

theory/base3.en.html

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+<h3>Base: 3</h3>
+<p>The ternary (base-3) numeral system uses three digits: 0, 1, and 2. Each position represents a power of 3.</p>
+<h3>How it works</h3>
+<div class="theory-example">112 = 1×9 + 1×3 + 2×1 = 14</div>
+<h3>Digits</h3>
+<div class="theory-example">0  1  2</div>
+<h3>Uses</h3>
+<p>Ternary systems are used in some specialized computing applications (ternary logic). Some argue that base-3 is the most efficient integer base for computation, as it is the closest to the mathematical constant e ≈ 2.718.</p>