add README

README.md

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+Deploy WireGuard with [UI](https://github.com/ngoduykhanh/wireguard-ui) and HAProxy
+
+WireGuard UI configuration example:
+
+    wireguard_ui_env: 
+      WGUI_USERNAME: admin
+      WGUI_PASSWORD: admin
+      WGUI_MTU: 1420
+      BIND_ADDRESS: 127.0.0.1:5001
+      SESSION_SECRET: 74f8155b3c91437db6e6c29c28e23ecc
+      WGUI_CONFIG_FILE_PATH: /etc/wireguard/wg0.conf
+
+HAProxy configuration example:
+
+    haproxy_ssl: yes
+    haproxy_self_signed_cert: yes
+    haproxy_config:
+      frontend:
+        well-known:
+          bind: ':80'
+          mode: http
+          acl:
+            - letsencrypt-acl path_beg /.well-known/acme-challenge/
+          http-request:
+            - redirect scheme https if !{ path_beg /.well-known/acme-challenge/ } !{ ssl_fc }
+          use_backend:
+            - letsencrypt-backend if letsencrypt-acl
+        https:
+          bind: ':443 ssl crt {{ haproxy_ssl_path }}'
+          mode: http
+          acl:
+            - letsencrypt-acl path_beg /.well-known/acme-challenge/
+          use_backend:
+            - letsencrypt-backend if letsencrypt-acl
+          default_backend: localhost_5001
+      backend:
+        letsencrypt-backend:
+          mode: http
+          server:
+            - letsencrypt 127.0.0.1:8080
+        localhost_5001:
+          mode: http
+          server:
+            - localhost 127.0.0.1:5001