add test

subjects/argsort/README.md

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+## argsort
+
+### Instructions
+
+Write a program that checks if an argument is sorted or not.
+- Your Program should return `T` followed by a newline (`'`\n'`) if an argument is sorted.
+- Your Program should return `F` followed by a newline (`'`\n'`) if an argument is not sorted.
+- Space and Tabulation are included in the sort.
+
+### Usage
+
+And it's output should be:
+
+```console
+$ go run . 
+$ go run . a | cat -e
+$ go run . " 5ABc" | cat -e
+T$
+$ go run . "zA1" | cat -e
+F$
+$ go run . "01Talent" "student" | cat -e
+$ go run . "Hello World" | cat -e
+F$
+$ go run .  "a b c" | cat -e
+F$
+$ go run .  "   abc" | cat -e
+T$
+```
+