Added basic syntax for dictionaries and lists (#1947)

yaml.md

@@ -5,12 +5,45 @@ layout: 2017/sheet
 prism_languages: [yaml]
 ---
 
+### Dictionaries and lists
+
+```yaml
+# comments start with "#"
+# dictionary are written like "key: value"
+name: Martin D'vloper
+languages:
+  perl: Elite
+  python: Elite
+  pascal: Lame
+
+# list items beginn with a "- "
+foods:
+  - Apple
+  - Orange
+  - Strawberry
+  - Mango
+
+# booleans are lower case
+employed: true
+```
+
+
 ### Multiline strings
 
 ```yaml
+# Literal Block Scalar
 Multiline: |
-  hello
+  exactly as you see
-  world
+  will appear these three
+  lines of poetry
+```
+
+```yaml
+# Folded Block Scalar
+Multiline: <
+  this is really a
+  single line of text
+  despite appearances
 ```
 
 ### Inheritance