fix: add readme, small fix (#2)

diff --git a/README.md b/README.md
index eb6dd49..827f9c0 100644
--- a/README.md
+++ b/README.md

@@ -1 +1,103 @@
-# django-authorization-example
\ No newline at end of file
+# Django-Authorization Example
+
+[Django-authorization, or dauthz](https://github.com/pycasbin/django-authorization) is an authorization library for Django framework.
+
+![image](https://user-images.githubusercontent.com/75596353/188881538-a6a99cb1-c88b-4738-bf4f-452be4fb7c2d.png)
+
+
+
+## How To Run the Example
+
+```
+pip install -r requirements.txt
+python manage.py makemigrations
+python manage.py migrate
+python manage.py runserver
+```
+
+## Configure of Example: by step
+
+### 1.add the django-orm-adapter and dauthz to INSTALLED_APPS
+
+```python
+INSTALLED_APPS = [
+    ...
+    # STEP1: setup adapter(django-orm-adapter here)
+    'casbin_adapter.apps.CasbinAdapterConfig',
+    # STEP2: setup django-authorization
+    'dauthz.apps.DauthzConfig',
+    # STEP3: setup the app of your app
+    'user_management.apps.UserManagementConfig',
+    ...
+]
+```
+
+### 2.add the middlewares you need to MIDDLEWARES
+
+```python
+MIDDLEWARE = [
+    ...
+    'django.contrib.auth.middleware.AuthenticationMiddleware',
+    # STEP2: setup django-authorization
+    # be aware: should after AuthenticationMiddleware
+    "dauthz.middlewares.request_middleware.RequestMiddleware",
+    ...
+]
+```
+
+### 3.add more config of adapter and dauthz
+
+```python
+# STEP1: setup adapter(django-orm-adapter here)
+CASBIN_MODEL = os.path.join(BASE_DIR, 'dauthz_model.conf')
+# STEP2: setup django-authorization
+DAUTHZ = {
+    # DEFAULT Dauthz enforcer
+    "DEFAULT": {
+        # Casbin model setting.
+        "MODEL": {
+            # Available Settings: "file", "text"
+            "CONFIG_TYPE": "file",
+            "CONFIG_FILE_PATH": CASBIN_MODEL,
+            "CONFIG_TEXT": "",
+        },
+        # Casbin adapter.
+        "ADAPTER": {
+            "NAME": "casbin_adapter.adapter.Adapter",
+        },
+        "LOG": {
+            # Changes whether Dauthz will log messages to the Logger.
+            "ENABLED": False,
+        },
+    },
+}
+```
+
+### 4. Add RBAC model to database(in /user_management/apps.py)
+
+```python
+p_rules = [
+        ["anonymous", "/", "(GET)|(POST)"],
+        ["anonymous", "/login", "(GET)|(POST)"],
+        ["anonymous", "/register", "(GET)|(POST)"],
+        ["normal_user", "/logout", "(GET)|(POST)"],
+        ["admin", "/all_users_profile", "(GET)|(POST)"],
+    ]
+g_rules = [
+    ["normal_user", "anonymous"],
+    ["admin", "normal_user"]
+]
+enforcer.add_policies(p_rules)
+enforcer.add_grouping_policies(g_rules)
+enforcer.save_policy()
+```
+
+#### Model of Example : 
+
+![image](https://user-images.githubusercontent.com/75596353/189869400-d7372ed9-99d1-4302-937a-dbc07e0d6fb4.png)
+
+### 5. Completed.
+
+## License
+
+This project is licensed under the [Apache 2.0 license](https://github.com/php-casbin/laravel-authz/blob/master/LICENSE).
\ No newline at end of file

diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..1872bec
--- /dev/null
+++ b/requirements.txt

@@ -0,0 +1,3 @@
+Django
+casbin-django-orm-adapter
+django_authorization

diff --git a/user_management/apps.py b/user_management/apps.py
index f0d5d5a..39734f4 100644
--- a/user_management/apps.py
+++ b/user_management/apps.py

@@ -1,23 +1,30 @@
+import os
+
 from django.apps import AppConfig
 
 
+def load_policy():
+    from dauthz.core import enforcer
+    p_rules = [
+        ["anonymous", "/", "(GET)|(POST)"],
+        ["anonymous", "/login", "(GET)|(POST)"],
+        ["anonymous", "/register", "(GET)|(POST)"],
+        ["normal_user", "/logout", "(GET)|(POST)"],
+        ["admin", "/all_users_profile", "(GET)|(POST)"],
+    ]
+    g_rules = [
+        ["normal_user", "anonymous"],
+        ["admin", "normal_user"]
+    ]
+    enforcer.add_policies(p_rules)
+    enforcer.add_grouping_policies(g_rules)
+    enforcer.save_policy()
+
+
 class UserManagementConfig(AppConfig):
     default_auto_filed = 'django.db.models.BigAutoField'
     name = 'user_management'
 
     def ready(self):
-        from dauthz.core import enforcer
-        p_rules = [
-            ["anonymous", "/", "(GET)|(POST)"],
-            ["anonymous", "/login", "(GET)|(POST)"],
-            ["anonymous", "/register", "(GET)|(POST)"],
-            ["normal_user", "/logout", "(GET)|(POST)"],
-            ["admin", "/all_users_profile", "(GET)|(POST)"],
-        ]
-        g_rules = [
-            ["normal_user", "anonymous"],
-            ["admin", "normal_user"]
-        ]
-        enforcer.add_policies(p_rules)
-        enforcer.add_grouping_policies(g_rules)
-        enforcer.save_policy()
+        if os.environ.get('RUN_MAIN'):
+            load_policy()