Add tasks for all the new languages

Task/Non-decimal-radices-Convert/Sidef/non-decimal-radices-convert-1.sidef

@@ -0,0 +1,2 @@
+say 60272032366.base(36)    # convert number to string
+say Number("rosetta", 36)   # convert string to number

Task/Non-decimal-radices-Convert/Sidef/non-decimal-radices-convert-2.sidef

@@ -0,0 +1,20 @@
+static to = [@|'0'..'9', @|'a'..'z']
+static from = Hash(to.pairs.map{@|_}.flip...)
+
+func base_to(n, b) {
+    var s = ""
+    while (n) {
+        s += to[n % b]
+        n //= b
+    }
+    s.reverse
+}
+
+func base_from(n, b) {
+    var t = 0
+    n.each { |c| t = (b*t + from{c}) }
+    t
+}
+
+say base_from("rosetta", 36)        # string to number
+say base_to(60272032366, 36)        # number to string