Add tutorial for dimik-descending-number (#467)

* Creating an editorial for dimik-descending-number

* Update en.md

* Update en.md

* Update en.md

* Update en.md

dimik-descending-number/en.md

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+# Dimik - Descending Number
+
+In this problem,you will not be given any inputs. The only thing which you will have to do is to print all the numbers starting from 1 upto 1000 but in descending order.  
+
+### Solution 
+* Each number has to be seperated using the `space` character.
+* Each line will consist of exactly 5 numbers not more nor less. 
+
+### C++
+```cpp
+#include <bits/stdc++.h>
+using namespace std;
+int main()
+{
+    int cnt = 0;
+    for (int i = 1000; i >= 1; i--)
+    {
+        cout << i;
+        if(i%5!=1) cout<<" "; 
+        cnt++;
+        if (cnt == 5)
+        {
+            cout << endl;
+            cnt = 0;
+        }
+    }
+}
+```