Added entry for CamelCase enum value

The approved style for enum values is CamelCase, as per crystal-lang/crystal#7270 However this is not stated in the style guide, although the approved style for constants is.
crush-157 · May 6, 2020 · 1a7276a · 1a7276a
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commit 1a7276a
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diff --git a/conventions/coding_style.md b/conventions/coding_style.md
@@ -65,6 +65,15 @@ LUCKY_NUMBERS     = [3, 7, 11]
 DOCUMENTATION_URL = "http://crystal-lang.org/docs"
 ```
 
+__Enum Value Names__ are camelcased.  For example:
+
+```crystal
+enum IceCream::Flavour
+  Vanilla
+  SaltedCaramel
+  MintChocChip
+end
+```
 ### Acronyms
 
 In class names, acronyms are _all-uppercase_. For example, `HTTP`, and `LibXML`.