docs : README 작성 (#5)

README.md

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+# spring-security-authorization-manager
+
+![spring-security-authorization-manager](https://socialify.git.ci/SWM-KAWAI-MANS/spring-security-authorization-manager/image?description=1&descriptionEditable=&font=Raleway&language=1&name=1&owner=1&pattern=Floating%20Cogs&stargazers=1&theme=Light)
+
+### Description
+Spring security 인가 설정을 편리하게 지원하는 라이브러리입니다.
+
+### Features
+- JWT를 통한 인가 필터
+- RequestMatcher에 허용되는 Role 구성에 따른 인가권한 부여
+- Filter를 예외하는 exclusions 설정
+
+### Getting Started
+To get started with spring-security-authorization-manager, follow these steps:
+
+1. Add the jitpack.io repository to your project's build.gradle file:
+```gradle
+repositories {
+    ...
+    maven { url 'https://jitpack.io' }
+}
+```
+
+2. Add the spring-security-authorization-manager dependency to your app-level build.gradle file:
+```
+dependencies {
+	      implementation 'com.github.SWM-KAWAI-MANS:spring-security-authorization-manager:1.0.0'
+}
+```
+
+## 사용법
+1. filter 처리를 안하는 엔드포인트를 설정합니다. application.yml 혹은 properties로 설정하면 됩니다. 만약 처리를 안하는 앤드포인트가 없으면 빈 값으로 두어도 상관 없습니다.
+```
+auth:
+  filter:
+    exclusions:
+      - hello
+      - world
+```
+
+2. AuthorizationRegistry를 설정합니다. 기본값은 anyRequest().authenticated() 로 설정되어있습니다.
+```java
+public class CustomAuthorizationRegistry implements AuthorizationRegistry {
+    @Override
+    public AuthorizeHttpRequestsConfigurer<HttpSecurity>.AuthorizationManagerRequestMatcherRegistry
+            match(
+                    AuthorizeHttpRequestsConfigurer<HttpSecurity>
+                                    .AuthorizationManagerRequestMatcherRegistry
+                            r) {
+        return r.anyRequest().authenticated();
+    }
+}
+```