add fish hello world

Author: tot0p

Fish/helloworld.fish

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+"hello, world"r\
+          o;!?l<

Fish/readme.md

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+# Fish Hello World
+
+"><>" (pronounced as if it were spelled as “fish”) is a stack-based, reflective, two-dimensional esoteric programming language.
+
+You can found fish at: [><>](https://esolangs.org/wiki/Fish)
+
+# run the program
+
+for run you need an interpreter, you can found at: [><>](https://esolangs.org/wiki/Fish#Interpreters)
+
+or you can use the online interpreter: [><>](https://suppen.no/fishlanguage/)