ATL-7246: Add old contributors list

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 +1,22 @@
+# 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)
+- [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)
+