Add logo to README.

Author: hsluoyz

README.md

@@ -1,2 +1,46 @@
-# jCasbin
-An authorization library that supports access control models like ACL, RBAC, ABAC in JAVA. This project is a JAVA port of the original Golang [Casbin](https://github.com/casbin/casbin).
+jCasbin
+====
+
+[![Build Status](https://travis-ci.org/casbin/jcasbin.svg?branch=master)](https://travis-ci.org/casbin/jcasbin)
+[![Release](https://img.shields.io/github/release/casbin/jcasbin.svg)](https://github.com/casbin/jcasbin/releases/latest)
+[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/casbin/lobby)
+[![Patreon](https://img.shields.io/badge/patreon-donate-yellow.svg)](http://www.patreon.com/yangluo)
+[![Sourcegraph Badge](https://sourcegraph.com/github.com/casbin/jcasbin/-/badge.svg)](https://sourcegraph.com/github.com/casbin/jcasbin?badge)
+
+**Note**: This project is a Java port of the original Golang [Casbin](https://github.com/casbin/casbin).
+
+![casbin Logo](casbin-logo.png)
+
+jCasbin is a powerful and efficient open-source access control library for Java projects. It provides support for enforcing authorization based on various [access control models](https://en.wikipedia.org/wiki/Computer_security_model).
+
+## Supported models
+
+1. [**ACL (Access Control List)**](https://en.wikipedia.org/wiki/Access_control_list)
+2. **ACL with [superuser](https://en.wikipedia.org/wiki/Superuser)**
+3. **ACL without users**: especially useful for systems that don't have authentication or user log-ins.
+3. **ACL without resources**: some scenarios may target for a type of resources instead of an individual resource by using permissions like ``write-article``, ``read-log``. It doesn't control the access to a specific article or log.
+4. **[RBAC (Role-Based Access Control)](https://en.wikipedia.org/wiki/Role-based_access_control)**
+5. **RBAC with resource roles**: both users and resources can have roles (or groups) at the same time.
+6. **RBAC with domains/tenants**: users can have different role sets for different domains/tenants.
+7. **[ABAC (Attribute-Based Access Control)](https://en.wikipedia.org/wiki/Attribute-Based_Access_Control)**: syntax sugar like ``resource.Owner`` can be used to get the attribute for a resource.
+8. **[RESTful](https://en.wikipedia.org/wiki/Representational_state_transfer)**: supports paths like ``/res/*``, ``/res/:id`` and HTTP methods like ``GET``, ``POST``, ``PUT``, ``DELETE``.
+9. **Deny-override**: both allow and deny authorizations are supported, deny overrides the allow.
+10. **Priority**: the policy rules can be prioritized like firewall rules.
+
+## License
+
+This project is licensed under the [Apache 2.0 license](https://github.com/casbin/casbin/blob/master/LICENSE).
+
+## Contact
+
+If you have any issues or feature requests, please contact us. PR is welcomed.
+- https://github.com/casbin/casbin/issues
+- [email protected]
+- Tencent QQ group: [546057381](//shang.qq.com/wpa/qunwpa?idkey=8ac8b91fc97ace3d383d0035f7aa06f7d670fd8e8d4837347354a31c18fac885)
+
+## Donation
+
+[![Patreon](https://hsluoyz.github.io/donation/patreon.png)](http://www.patreon.com/yangluo)
+
+![Alipay](https://hsluoyz.github.io/donation/donate_alipay.png)
+![Wechat](https://hsluoyz.github.io/donation/donate_weixin.png)