Add tasks for all the new languages

Lang/Set-lang/00DESCRIPTION

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+{{stub}}
+{{language|Set lang}}
+[[Category:Esoteric_Languages]]
+
+[https://www.reddit.com/r/esolangs/comments/54b0b1/set_an_language_with_1_command/ Original reddit post] by the user [https://www.reddit.com/user/qwertyu63 qwertyu63], with the original specifications on how the language works.
+
+The '''Set''' language uses only a single command, ''set''. It allows for 52 development variables and 1 system variable.
+It is ASCII based, so output is in the integer format, and is converted to characters upon ran.
+
+There is currently an [https://avellar.ml/set-lang online implementation] of a '''Set''' interpreter, done in JavaScript. A [https://github.com/MatheusAvellar/set-lang public GitHub repository] also exists, so feel free to contribute.

Lang/Set-lang/99-Bottles-of-Beer

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+../../Task/99-Bottles-of-Beer/Set-lang

Lang/Set-lang/Comments

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+../../Task/Comments/Set-lang

Lang/Set-lang/Death-Star

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+../../Task/Death-Star/Set-lang

Lang/Set-lang/Empty-program

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+../../Task/Empty-program/Set-lang

Lang/Set-lang/Hello-world-Text

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+../../Task/Hello-world-Text/Set-lang

Lang/Set-lang/Nth

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+../../Task/Nth/Set-lang

Lang/Set-lang/README

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+Data source: http://rosettacode.org/wiki/Category:Set_lang

Lang/Set-lang/Variables

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+../../Task/Variables/Set-lang