Add example to slack modal for new puzzle

Author: FionaDL

app/lib/slack_client/views/puzzle_form.rb

@@ -8,7 +8,16 @@ def create
           end
 
           blocks.input label: "What is the Puzzle question?", block_id: "question" do |input|
-            input.plain_text_input action_id: "question", multiline: true
+              input.plain_text_input(
+              action_id: "question",
+              multiline: true,
+              placeholder: "See template below"
+            )
+          end
+
+          blocks.context do |context|
+            context.mrkdwn text: "*Puzzle Examples*"
+            context.plain_text text: placeholder_text
           end
 
           blocks.input label: "Answer", block_id: "answer" do |input|
@@ -42,6 +51,25 @@ def intro_text
           When providing the question, please provide ONLY the question text, without any additional introduction (for example, do not include "Is this ruby or rails?"). The bot will add that automatically.
         TEXT
       end
+
+      def placeholder_text
+        <<~TEXT
+
+          Example: Multi-line Snippet
+
+          In this snippet:
+
+          ```
+          Time.current.strftime("%Y-%m-%dT%H:%M:%S%z")
+          ```
+
+          Is the `current` method a Ruby or Rails method?
+
+          Example: Single Sentence Snippet
+
+          When you have a line like this `hash = { a: 1, b: 2, c: 3 }` and later you call this method `hash.transform_keys(&:to_s)` -- is `transform_keys` a Ruby or Rails method?
+        TEXT
+      end
     end
   end
 end