Initial files for raindrops approaches

Author: BNAndras

exercises/practice/raindrops/.approaches/config.json

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+{
+  "approaches": [
+    {
+      "uuid": "8338d92d-8719-4c1b-aabe-95821881c4cd",
+      "slug": "if-else-statements",
+      "title": "If Else Statements",
+      "blurb": "Use conditional logic to test each factor rule",
+      "authors": [
+        "BNAndras"
+      ]
+    },
+    {
+      "uuid": "c214970f-ff2b-43a2-93a6-6478c8ec1c63",
+      "slug": "list-of-rules",
+      "title": "Looping Over List of Rules",
+      "blurb": "Loop over a list of factor rules and apply them",
+      "authors": [
+        "BNAndras"
+      ]
+    }
+  ]
+}

exercises/practice/raindrops/.approaches/if-else-statements/content.md

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+# If Else Statements
+
+```vim
+function! Raindrops(number) abort
+  let l:str = ''
+  if a:number % 3 == 0
+    let l:str .= 'Pling'
+  endif
+  if a:number % 5 == 0
+    let l:str .= 'Plang'
+  endif
+  if a:number % 7 == 0
+    let l:str .= 'Plong'
+  endif
+  return empty(l:str) ? string(a:number) : l:str
+endfunction
+```

exercises/practice/raindrops/.approaches/if-else-statements/snippet.txt

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+function! Raindrops(number) abort
+  let l:str = ''
+  if a:number % 3 == 0
+    let l:str .= 'Pling'
+  endif
+  if a:number % 5 == 0
+    let l:str .= 'Plang'
+# cut for snippet brevity

exercises/practice/raindrops/.approaches/introduction.md

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+# Introduction
+
+Here are two common approaches for this exercise.
+
+## Approach: If else statements
+
+```vim
+function! Raindrops(number) abort
+  let l:str = ''
+  if a:number % 3 == 0
+    let l:str .= 'Pling'
+  endif
+  if a:number % 5 == 0
+    let l:str .= 'Plang'
+  endif
+  if a:number % 7 == 0
+    let l:str .= 'Plong'
+  endif
+
+  return empty(l:str) ? string(a:number) : l:str
+endfunction
+```
+
+For more information, check the [if else statements approach][approach-if-else-statements].
+
+## Approach: Looping over a list of rules
+
+```vim
+let s:rules = [[3, 'Pling'], [5, 'Plang'], [7, 'Plong']]
+
+function! Raindrops(number) abort
+  let l:str = ''
+
+  for [l:factor, l:sound] in s:rules
+    if a:number % l:factor == 0
+      let l:str .= l:sound
+    endif
+  endfor
+
+  return empty(l:str) ? string(a:number) : l:str
+endfunction
+```
+
+For more information, check the [looping over a list of rules approach][approach-list-of-rules].
+
+
+[approach-if-else-statements]: https://exercism.org/tracks/vimscript/exercises/raindrops/approaches/if-else-statements
+[approach-boolean-chain]: https://exercism.org/tracks/vimscript/exercises/raindrops/approaches/list-of-rules

exercises/practice/raindrops/.approaches/list-of-rules/content.md

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+# Looping Over A List of Rules
+
+```vim
+let s:rules = [[3, 'Pling'], [5, 'Plang'], [7, 'Plong']]
+
+function! Raindrops(number) abort
+  let l:str = ''
+
+  for [l:factor, l:sound] in s:rules
+    if a:number % l:factor == 0
+      let l:str .= l:sound
+    endif
+  endfor
+
+  return empty(l:str) ? string(a:number) : l:str
+endfunction
+```

exercises/practice/raindrops/.approaches/list-of-rules/snippet.txt

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+let s:rules = [[3, 'Pling'], [5, 'Plang'], [7, 'Plong']]
+
+function! Raindrops(number) abort
+  let l:str = ''
+  for [l:factor, l:sound] in s:rules
+    if a:number % l:factor == 0
+      let l:str .= l:sound
+# cut for snippet brevity