Create to-ini.nu (#386)

* Create to-ini.nu

Nushell doesn't have a builtin serializer for ini files and I needed it for awscli profiles so here it is.

* moved to formats subdir

---------

Co-authored-by: Yethal <nosuchemail@email.com>

formats/to-ini.nu

@@ -0,0 +1,13 @@
+# converts records into .ini files
+export def "to ini" [] {
+  transpose key value
+  | update value {|row|
+    get value
+    | transpose key value
+    | format '{key}={value}'
+    | prepend $"[($row.key)]"
+    | str join (char nl)
+  }
+  | get value
+  | str join (char nl)
+}