Add docs

README.md

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+# url_unsafe
+
+Set urlsafe strings back to regularly formatted URLs.
+
+## Usage
+
+`url_unsafe https%3A%2F%2Fwww.facebook.com%2F`
+
+Output:
+
+`https://www.facebook.com/`
+
+## Output of -h
+
+```
+usage: url_unsafe [-h] [--version] [safe_string]
+
+Set urlsafe strings back to regularly formatted URLs.
+
+positional arguments:
+  safe_string    The string to convert from urlsafe to a URL.
+
+options:
+  -h, --help     show this help message and exit
+  --version, -v  Print the current version number.
+```