Add base code (#1)

Add base code from https://gitea.communiquons.org/pierre/oidc-test-client with minor improvements

Reviewed-on: #1

README.md

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+# Actix Remote IP extractor
+[![Build Status](https://drone.communiquons.org/api/badges/pierre/actix-remote-ip/status.svg)](https://drone.communiquons.org/pierre/actix-remote-ip)
+[![Crate](https://img.shields.io/crates/v/actix-remote-ip.svg)](https://crates.io/crates/actix-remote-ip)
+
+Tiny extractor of remote user IP address, that handles reverse proxy.
+
+The `X-Forwarded-For` header is automatically parsed when the request comes from a defined proxy, to determine the real remote client IP Address.
+
+Note : regarding IPv6 addresses, the local part of the address is discarded. For example, the  IPv6 client `2001:0db8:85a3:0000:0000:8a2e:0370:7334` will be returned as `2001:0db8:85a3:0000:0000:0000:0000:0000`
+
+## Configuration
+Configure it when you configure your Actix server:
+
+```rust
+HttpServer::new(move || {
+    App::new()
+        .app_data(web::Data::new(RemoteIPConfig {
+            proxy: Some("IP".to_string())
+        }))
+    // ...
+})
+```
+
+## Usage
+In your route, add a `RemoteIP` parameter:
+
+```rust
+#[get("/")]
+async fn home(remote_ip: RemoteIP) -> HttpResponse {
+    let ip: IpAddr = remote_ip.0;
+    // ...
+}
+```