(chore): add DEVELOPER.md

dotneet · dotneet · commit 7447c9cc13d1 · 2022-11-12T13:24:43.000+09:00
diff --git a/DEVELOPER.md b/DEVELOPER.md
@@ -0,0 +1,13 @@
+# Run playground
+
+```bash
+yarn run dev
+```
+
+# Run unit tests
+
+```bash
+yarn dev:prepare
+yarn test
+```
+
