Add tasks for all the new languages

Task/Closest-pair-problem/Ring/closest-pair-problem.ring

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+decimals(10)
+x = list(10)
+y = list(10)
+x[1] = 0.654682
+y[1] = 0.925557
+x[2] = 0.409382
+y[2] = 0.619391
+x[3] = 0.891663
+y[3] = 0.888594
+x[4] = 0.716629
+y[4] = 0.996200
+x[5] = 0.477721
+y[5] = 0.946355
+x[6] = 0.925092
+y[6] = 0.818220
+x[7] = 0.624291
+y[7] = 0.142924
+x[8] = 0.211332
+y[8] = 0.221507
+x[9] = 0.293786
+y[9] = 0.691701
+x[10] = 0.839186
+y[10] = 0.728260
+
+min = 10000
+for i = 1 to 9
+    for j = i+1 to 10
+        dsq = pow((x[i] - x[j]),2) + pow((y[i] - y[j]),2)
+        if dsq < min min = dsq  mini = i minj = j ok
+    next
+next
+see "closest pair is : " + mini + " and " + minj + " at distance " + sqrt(min)