Add example inputs

examples/leibniz_pi/leibniz_pi.mc

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+float kth(float k)
+{
+
+    return 1.0 / (2.0 * k + 1.0);
+}
+
+int main()
+{
+
+    print("Please enter a number: ");
+
+    float sign;
+    float n;
+    float i;
+    float pi;
+
+    i = 1.0;
+    n = read_float();
+    print_nl();
+    sign = 1.0;
+    pi = 1.0;
+
+    while (i < n)
+    {
+        sign = sign * (-1.0);
+        pi = pi + sign * kth(i);
+        i = i + 1.0;
+    }
+
+    pi = pi*4.0;
+
+    print("Pi is approximately ");
+    print_float(pi);
+    print_nl();
+
+    return 0;
+}

examples/leibniz_pi/leibniz_pi.stdin.txt

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+32

examples/leibniz_pi/leibniz_pi.stdout.txt

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+Please enter a number: 
+Pi is approximately 3.11