Add reverse-string approaches

exercises/practice/reverse-string/.approaches/config.json

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+{
+  "approaches": [
+    {
+      "uuid": "b7d9f537-d0f7-4f80-b22a-c74ad88b949f",
+      "slug": "list-of-characters",
+      "title": "Reverse a List of Characters",
+      "blurb": "Explode the string into a list of characters and reverse the list",
+      "authors": [
+        "BNAndras"
+      ]
+    },
+    {
+      "uuid": "8a1adc50-f84f-4d3d-acdb-26c1677d4c69",
+      "slug": "looping-in-reverse",
+      "title": "Looping in Reverse",
+      "blurb": "Loop over the string backwards and build up a new string",
+      "authors": [
+        "BNAndras"
+      ]
+    }
+  ]
+}

exercises/practice/reverse-string/.approaches/introduction.md

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+# Introduction
+
+There are two common approaches highlighted here for this exercise.
+
+## Approach: Reversing a list of characters
+
+```vim
+function! Reverse(text) abort
+    return join(reverse(split(a:text, '\zs')), '')
+endfunction
+```
+
+For more information, check the [reversing a list of characters approach][approach-list-of-characters].
+
+## Approach: Looping in reverse
+
+```vim
+function! Reverse(text) abort
+    let l:reversed = ""
+    for i in range(len(a:text) - 1, -1, -1)
+        let l:reversed .= a:text[i]
+    endfor
+    return reversed
+endfunction
+```
+
+For more information, check the [looping in reverse approach][approach-loop-in-reverse].
+
+[modulo-operator]: https://en.wikipedia.org/wiki/Modulo
+[approach-list-of-characters]: https://exercism.org/tracks/vimscript/exercises/reverse-string/approaches/list-of-characters
+[approach-looping-in-reverse]: https://exercism.org/tracks/vimscript/exercises/reverse-string/approaches/looping-in-reverse

exercises/practice/reverse-string/.approaches/list-of-characters/content.md

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+# Reverse a List of Characters
+
+```vim
+function! Reverse(text) abort
+    return join(reverse(split(a:text, '\zs')), '')
+endfunction
+```

exercises/practice/reverse-string/.approaches/list-of-characters/snippet.txt

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+function! Reverse(text) abort
+    return join(reverse(split(a:text, '\zs')), '')
+endfunction

exercises/practice/reverse-string/.approaches/looping-in-reverse/content.md

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+# Loop In Reverse
+
+```vim
+function! Reverse(text) abort
+    let l:reversed = ""
+    for i in range(len(a:text) - 1, -1, -1)
+        let l:reversed .= a:text[i]
+    endfor
+    return reversed
+endfunction
+```

exercises/practice/reverse-string/.approaches/looping-in-reverse/snippet.txt

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+function! Reverse(text) abort
+    let l:reversed = ""
+    for i in range(len(a:text) - 1, -1, -1)
+        let l:reversed .= a:text[i]
+    endfor
+    return reversed
+endfunction