add(replaceeven): subject

subjects/replaceeven/README.md

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+## replaceeven
+
+### Instructions
+
+Write a program that takes every character with an even index, of each argument and replace it with the number 2.
+
+- you program should always print `\n` at the end.
+- you program should print all the arguments in one line, separated by the space character `' '`.
+- zero is an even number.
+
+
+### Usage
+
+```sh
+$ go run . | cat -e
+$
+$ go run . hello 444444444444444 | cat -e
+2e2l2 242424242424242$
+$ go run main.go "Zone 01 is the best" | cat -e
+2o2e202 2s2t2e2b2s2$
+```