!61 增加 env 配置示例

Merge pull request !61 from F4NNIU/add_env_sample

.env.sample

@@ -0,0 +1,11 @@
+[app]
+debug = false
+trace = false
+
+[database]
+hostname = 127.0.0.1
+database = fastadmin
+username = root
+password = root
+hostport = 3306
+prefix = fa_