prettier: enable formatting

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: I4e140b0eca1945efa456c297085ae2e84e7c8d5d
diff --git a/.prettierrc.yaml b/.prettierrc.yaml
new file mode 100644
index 0000000..a69b879
--- /dev/null
+++ b/.prettierrc.yaml
@@ -0,0 +1,7 @@
+tabWidth: 4
+printWidth: 80
+proseWrap: "always"
+overrides:
+    - files: "*.md"
+      options:
+          tabWidth: 2