docs: configuration and usage

Signed-off-by: Rahul Baradol <rahul.baradol.14@gmail.com>

Author: Rahul-Baradol

providers/ofrep/README.md

@@ -1 +1,74 @@
-### Todo
+# OFREP Provider for OpenFeature
+
+This provider allows to connect to any feature flag management system that supports OFREP.
+
+## Installation
+For Maven
+<!-- x-release-please-start-version -->
+```xml
+<dependency>
+  <groupId>dev.openfeature.contrib.providers</groupId>
+  <artifactId>ofrep</artifactId>
+  <version>0.0.1</version>
+</dependency>
+```
+
+For Gradle
+```groovy
+implementation 'dev.openfeature.contrib.providers:ofrep:0.0.1'
+```
+<!-- x-release-please-end-version -->
+
+## Configuration and Usage
+
+### Usage
+```java
+OfrepProviderOptions options = OfrepProviderOptions.builder().build();
+OfrepProvider ofrepProvider = OfrepProvider.constructProvider(options);
+```
+### Example
+```java
+import dev.openfeature.contrib.providers.ofrep.OfrepProvider;
+import dev.openfeature.contrib.providers.ofrep.OfrepProviderOptions;
+import dev.openfeature.sdk.Client;
+import dev.openfeature.sdk.FlagEvaluationDetails;
+import dev.openfeature.sdk.MutableContext;
+import dev.openfeature.sdk.OpenFeatureAPI;
+
+public class App {
+    public static void main(String[] args) {
+        OpenFeatureAPI openFeatureAPI = OpenFeatureAPI.getInstance();
+
+        OfrepProviderOptions options = OfrepProviderOptions.builder().build();
+        OfrepProvider ofrepProvider = OfrepProvider.constructProvider(options);
+
+        openFeatureAPI.setProvider(ofrepProvider);
+
+        Client client = openFeatureAPI.getClient();
+
+        MutableContext context = new MutableContext();
+        context.setTargetingKey("my-identify-id");
+
+        FlagEvaluationDetails<Boolean> details = client.getBooleanDetails("my-boolean-flag", false, context);
+        System.out.println("Flag value: " + details.getValue());
+
+        openFeatureAPI.shutdown();
+    }
+}
+```
+
+### Configuration options
+
+Options are passed via `OfrepProviderOptions`, using which default values can be overridden.
+
+Given below are the supported configurations:
+
+
+| Option name | Type    | Default   | Description
+| ----------- | ------- | --------- | ---------
+| baseUrl      | String  | http://localhost:8016 | Override the default OFREP API URL.
+| headers      | ImmutableMap  | Empty Map | Add custom headers which will be sent with each network request to the OFREP API.
+| timeout      | Duration  | 10 Seconds | The timeout duration to establishing the connection.
+| proxySelector      | ProxySelector  | ProxySelector.getDefault() | The proxy selector used by HTTP Client.
+| executor      | Executor  | Thread Pool of size 5 | The executor used by HTTP Client.
+