Add prettierrc for editor compatibility

The tsserver lsp doesn't seem to work well with .editorconfig. Using
prettierrc will allow formatting to work correctly with editor plugins

This also updates editorconfig to work well with json

Change-type: patch

.editorconfig

@@ -11,5 +11,6 @@ insert_final_newline = true
 [*.md]
 trim_trailing_whitespace = false
 
-[*.json]
+[*.{json,yml}]
 indent_style = space
+indent_size = 2

.prettierrc.js

@@ -0,0 +1,5 @@
+const fs = require('fs');
+
+module.exports = JSON.parse(
+	fs.readFileSync('./node_modules/@balena/lint/config/.prettierrc', 'utf8'),
+);