ATL-7246: Add old contributors list (#858)

This commit adds the list of contributors for the Node repository. It
includes github users that go beyond the commit history displayed in the
repository today

Signed-off-by: EzequielPostan <ezequiel.postan@iohk.io>

CONTRIBUTORS.md

@@ -0,0 +1,23 @@
+# Contributors
+
+We would like to list here people who contributed to this project that may not be reflected in the commit history. In alphabetical order:
+
+- [AlexITC](https://github.com/AlexITC)
+- [amagyar-iohk](https://github.com/amagyar-iohk)
+- [antonbaliasnikov](https://github.com/antonbaliasnikov)
+- [CryptoKnightIOG](https://github.com/CryptoKnightIOG)
+- [esenese](https://github.com/esenese)
+- [EzequielPostan](https://github.com/EzequielPostan)
+- [FabioPinheiro](https://github.com/FabioPinheiro)
+- [itegulov](https://github.com/itegulov)
+- [KBabenkovScalac](https://github.com/KBabenkovScalac)
+- [krcz](https://github.com/krcz)
+- [loverdos](https://github.com/loverdos)
+- [milosbackonja](https://github.com/milosbackonja)
+- [mineme0110](https://github.com/mineme0110)
+- [pva701](https://github.com/pva701)
+- [shotexa](https://github.com/shotexa)
+- [vlad107](https://github.com/vlad107)
+- [wkoder](https://github.com/wkoder)
+- [zejaco](https://github.com/zejaco)
+