Move math libs API here temporarily

src/main/java/com/r35157/libs/math/UtilsBigDecimal.java

@@ -0,0 +1,13 @@
+package com.r35157.libs.math;
+
+import java.math.BigDecimal;
+import java.math.MathContext;
+
+public interface UtilsBigDecimal {
+    BigDecimal min(BigDecimal a, BigDecimal b);
+    BigDecimal max(BigDecimal a, BigDecimal b);
+    BigDecimal sqrt(BigDecimal value, MathContext mc);
+
+    BigDecimal TWO = new BigDecimal("2");
+    BigDecimal THREE = new BigDecimal("3");
+}

src/main/java/com/r35157/libs/math/UtilsDouble.java

@@ -0,0 +1,7 @@
+package com.r35157.libs.math;
+
+import java.math.BigDecimal;
+
+public interface UtilsDouble {
+    double erf(BigDecimal x);
+}