feat: add reverse-polish-notation challenge

challenges/reverse-polish-notation/README.md

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+# reverse-polish-notation
+
+Created by [@Divlo](https://github.com/Divlo) on 29 September 2020.
+
+## Instructions :
+
+Your job is to create a calculator which evaluates expressions in Reverse Polish notation (a mathematical notation in which operators follow their operands. It does not need any parentheses as long as each operator has a fixed number of operands).
+
+For example expression 5 1 2 + 4 * + 3 - (which is equivalent to 5 + ((1 + 2) * 4) - 3 in normal notation) should evaluate to 14.
+
+For your convenience, the input is formatted such that a space is provided between every token.
+
+Empty expression should evaluate to 0.
+
+Valid operations are +, -, *, /.
+
+You may assume that there won't be exceptional situations (like stack underflow or division by zero).
+
+## Source :
+
+- [Reverse polish notation - Codewars](https://www.codewars.com/kata/52f78966747862fc9a0009ae)
+
+## Examples :
+
+See the `input-output.json` file for examples of input/output.

challenges/reverse-polish-notation/input-output.json

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+[
+  {
+    "input": [""],
+    "output": 0
+  },
+  {
+    "input": ["3"],
+    "output": 3
+  },
+  {
+    "input": ["3.5"],
+    "output": 3.5
+  },
+  {
+    "input": ["1 3 +"],
+    "output": 4
+  },
+  {
+    "input": ["1 3 *"],
+    "output": 3
+  },
+  {
+    "input": ["1 3 -"],
+    "output": -2
+  },
+  {
+    "input": ["4 2 /"],
+    "output": 2
+  },
+  {
+    "input": ["5 3 + 12 8 + * 10 /"],
+    "output": 16
+  }
+]