subject(param_range):add Readme

subjects/paramrange/README.md

@@ -0,0 +1,20 @@
+## param-range
+
+### instructions
+
+- Write a program that takes a number in the arguments and prints the max and min.
+    - If the number of arguments is less than 2 print (`'\n'`)
+    - If one of the arguments is not a number, print (`"Error\n"`)
+    - The output should be space-separated and (`'\n'`) at the end.
+
+### Usage
+```console
+$ go run . | cat -e
+$
+$ go run . 1 2 3 4 5 6 7 8 9 | cat -e
+1 9$
+$ go run . -1 1 | cat -e
+-1 1$
+$ go run . 1 a 2 3 4 5 6 7 8 9 | cat -e
+$
+```