Add exa aliases

aliases/exa/README.md

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+Some aliases for exa!
+
+# Preparations
+Copy the `nu_aliases_exa.nu` to your `$env.NU_LIB_DIRS` and add the following to
+your `config.nu`:
+
+```nu
+use nu_alias_exa.nu *
+
+# or if you want to add the prefix:
+use nu_alias_exa.nu
+```
+
+For more information of how to load it, click
+[here](https://www.nushell.sh/book/modules.html#using-modules).

aliases/exa/nu_alias_exa.nu

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+export alias x = exa --icons --all
+export alias xl = exa --all --long
+export alias xt = exa --icons --all --tree