format-code: enable prettier

prettier is a formatter for YAML, JSON, Markdown, etc.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I7a47d02ef7382d811423b97a88132aa92b991eed
diff --git a/config/prettierrc.yaml b/config/prettierrc.yaml
new file mode 100644
index 0000000..a69b879
--- /dev/null
+++ b/config/prettierrc.yaml
@@ -0,0 +1,7 @@
+tabWidth: 4
+printWidth: 80
+proseWrap: "always"
+overrides:
+    - files: "*.md"
+      options:
+          tabWidth: 2