feat(nushell): add nu shell configuration

config/nushell/.gitignore

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+history.txt

config/nushell/config.nu

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+# config.nu
+#
+# Installed by:
+# version = "0.106.1"
+#
+# This file is used to override default Nushell settings, define
+# (or import) custom commands, or run any other startup tasks.
+# See https://www.nushell.sh/book/configuration.html
+#
+# Nushell sets "sensible defaults" for most configuration settings,
+# so your `config.nu` only needs to override these defaults if desired.
+#
+# You can open this file in your default editor using:
+#     config nu
+#
+# You can also pretty-print and page through the documentation for configuration
+# options using:
+#     config nu --doc | nu-highlight | less -R
+
+$env.config.buffer_editor = "nvim"