Update README.md

Author: essential2189

README.md

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+<!-- PROJECT LOGO -->
+<br />
+<div align="center">
+<h2>nestjs-parameter-store</h2>
 
+  <p align="center">
+    NestJS AWS Parameter Store
+    <br>
+    Use nestjs managed <a href="https://docs.aws.amazon.com/ko_kr/systems-manager/latest/userguide/what-is-systems-manager.html">AWS Systems Manager</a>.
+  </p>
+</div>
+
+<br>
+
+<!-- TABLE OF CONTENTS -->
+
+## Table of Contents
+
+<ol>
+  <li><a href="#installation">Installation</a></li>
+  <li><a href="#configuration">Configuration</a></li>
+  <li><a href="#service">Service</a></li>
+  <li><a href="#license">License</a></li>
+</ol>
+
+<!-- INSTALLATION -->
+
+## Installation
+
+```sh
+npm install nestjs-parameter-store @aws-sdk/client-ssm
+
+pnpm install nestjs-parameter-store @aws-sdk/client-ssm
+```
+
+## Configuration
+
+Configure the module `forRoot()` or `forRootAsync()` to access all the
+AWS System Manager service in production.
+
+Configure the module `registerParamStore()` or `registerParamStoreAsync()` to
+loaded all the parameters in AWS Parameter Store in production using `@Inject(GET_PARAMETERS)`
+
+### Static configuration
+
+```typescript
+import {Module} from "@nestjs/common";
+import {NestjsParameterStoreModule} from "nestjs-parameter-store";
+
+@Module({
+    imports: [
+        NestjsParameterStoreModule.forRoot({region: "region"}),
+        NestjsParameterStoreModule.registerParamStore({
+            Path: "/test",
+            Recursive: true,
+            WithDecryption: true,
+        }),
+    ],
+})
+export class AppModule {
+}
+```
+
+### Async configuration
+
+```typescript
+import {Module} from "@nestjs/common";
+import {NestjsParameterStoreModule} from "nestjs-parameter-store";
+
+@Module({
+    imports: [
+        NestjsParameterStoreModule.forRootAsync({
+            imports: [ConfigModule],
+            inject: [ConfigService],
+            useFactory: async (config: ConfigService) => {
+                const {region, accessKeyId, secretAccessKey} = config.get("aws");
+                return {region, accessKeyId, secretAccessKey};
+            },
+        }),
+        NestjsParameterStoreModule.registerParamStoreAsync({
+            imports: [ConfigModule],
+            inject: [ConfigService],
+            useFactory: async (config: ConfigService) => {
+                const {path} = config.get("aws-param-store");
+                return {Path: path, Recursive: true, WithDecryption: true};
+            },
+        }),
+    ],
+})
+export class AppModule {
+}
+```
+
+## Service
+
+This module exposes the following services.
+
+### AwsParamStoreService
+
+The `AwsParamStoreService` allows you to access the configuration loaded from AWS Parameter Store. Use its own class
+name as the injection token.
+
+The `AwsParamStoreService` exposes the following methods:
+
+- getParameter({ Name: String, WithDecryption: Boolean })
+- getParameters({ Name: String[], WithDecryption: Boolean })
+- getParametersByPath({ Path: String, Recursive: true, WithDecryption: true })
+
+```typescript
+import {Injectable} from "@nestjs/common";
+import {AwsParamStoreService} from "nestjs-parameter-store";
+
+@Injectable()
+export class TestService {
+    constructor(private readonly awsParameterStore: AwsParameterStore) {
+        console.log(awsParamStoreService.getParameter({Name: "/test/parameter"}));
+        console.log(
+            awsParamStoreService.getParameters({
+                Names: ["/test/parameter", "/test/secure"],
+                WithDecryption: true,
+            }),
+        );
+        console.log(
+            awsParamStoreService.getParametersByPath({
+                Path: "/test",
+                Recursive: true,
+                WithDecryption: true,
+                OnlyValue: true,
+            }),
+        );
+    }
+}
+```
+
+### GET_PARAMETERS
+
+You can access the parameters loaded from the Parameter Store by configuration `registerParamStore()`
+or `registerParamStoreAsync()`
+
+`@Inject(GET_PARAMETERS)` is functionally the same as `getParametersByPath()`.
+
+```typescript
+import {Inject, Injectable} from "@nestjs/common";
+import {GET_PARAMETERS} from "nestjs-parameter-store";
+import {Parameter} from "@aws-sdk/client-ssm";
+
+@Injectable()
+export class ParameterStoreService {
+    constructor(@Inject(GET_PARAMETERS) private readonly parameters: Parameter[]) {
+        console.log(parameters)
+    }
+}
+```