Add tasks for all the new languages

Task/Prime-decomposition/Ring/prime-decomposition.ring

@@ -0,0 +1,20 @@
+prime = 18705
+decomp(prime)
+
+func decomp nr
+x = ""
+for i = 1 to nr
+    if isPrime(i) and nr % i = 0
+       x = x + string(i) + " * " ok
+    if i = nr
+       x2 = substr(x,1,(len(x)-2))
+       see string(nr) + " = " + x2 + nl ok
+next
+
+func isPrime num
+     if (num <= 1) return 0 ok
+     if (num % 2 = 0) return 0 ok
+     for i = 3 to floor(num / 2) -1 step 2
+         if (num % i = 0) return 0 ok
+     next
+     return 1