Add boolean logical AND operator

Author: stoned

doc/Language/operators.pod6

@@ -1322,6 +1322,15 @@ and then performs a numeric bitwise right shift on the bits of the buffer.
 
 Please note that this has not yet been implemented.
 
+=head2 infix C«?&»
+
+    multi sub infix:<?&>(Mu $x = Bool::True)
+    multi sub infix:<?&>(Mu \a, Mu \b)
+
+X<Boolean logical AND operator>. Coerces the argument(s) to L<Bool|/type/Bool>
+and performs logical AND on them: it will return True if and only if both
+arguments are true. It returns identity on a single argument.
+
 =head2 infix C«gcd»
 
     multi sub infix:<gcd>($a, $b --> Int:D)