Created Naming concentions (reusing spec names) (markdown)

Naming-concentions-(reusing-spec-names).md

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+### Naming convention
+
+Ethereum Foundation uses:
+  - snake_case for fields and procedure names
+  - MACRO_CASE for constants
+  - PascalCase for types
+
+Nim NEP-1 recommends:
+  - camelCase for fields and procedure names
+  - PascalCase for constants
+  - PascalCase for types
+
+To facilitate collaboration and comparison, nim-beacon-chain uses the Ethereum Foundation convention.