fix(be):add playground & change log dir

.gitignore

@@ -4,4 +4,24 @@ web/build
 *.db
 .DS_Store
 .eslintcache
-.env
+.env
+
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# ignore ide config
+.idea
+.vscode
+
+# vim
+*.swp
+
+
+# playground
+playground/next-terminal
+
+/log