Add instructions on readme

README.md

@@ -3,3 +3,83 @@
 [![Build Status](https://drone.faercol.me/api/badges/PolyculeConnect/polycule-connect/status.svg)](https://drone.faercol.me/PolyculeConnect/polycule-connect)
 
 PolyculeConnect
+
+## Configuration
+
+Here is an example config file
+
+```json
+{
+    "log": {
+        "level": "debug" // debug,info,warn,error
+    },
+    "server": {
+        "port": 5000, // only used in net mode
+        "host": "0.0.0.0",  // only used in net mode
+        // "sock": "/your/sock.sock" // path to your unix sock if "mode" is set to "unix"
+        "mode": "net" // net,unix
+    },
+    "openconnect": {
+        "issuer": "https://polyculeconnect.domain", // hostname of your polyculeconnect server
+        "clients": [
+            {
+                "name": "<name>",
+                "id": "<client_id>",
+                "secret": "<client_secret>",
+                "redirectURIs": [
+                    "<redirect_uri>"
+                ]
+            }
+        ],
+        "backends": [
+            {
+                "id": "<unique_id>",
+                "name": "<human_readable_name>",
+                "local": true,
+                "type": "oidc", // must be "oidc" for now
+                "config": {
+                    "issuer": "https://polyculeconnect.domain", // must be the same as current issuer
+                    "clientID": "<client_id>",
+                    "clientSecret": "<client_secret>",
+                    "redirectURI": "<redirect_uri>"
+                }
+            },
+        ]
+    }
+}
+```
+
+You can register multiple backend and multiple clients (applications)
+
+## Running the server
+
+### Running from sources
+
+```bash
+# clone the directory
+git clone https://git.faercol.me/PolyculeConnect/polycule-connect.git
+
+cd polycule-connect
+
+# build the sources
+make -C polyculeconnect build
+
+# edit the configuration file
+vim config.json
+
+# run the application
+./polyculeconnect/build/polyculeconnect -config config.json
+```
+
+### Running from docker image
+
+```bash
+# edit the configuration file
+mkdir -p config
+vim config/config.json
+
+# run the docker container
+docker run -v ./config/:/config -p 5000:5000 -it git.faercol.me/polyculeconnect/polyculeconnect:latest
+```
+
+Or using the example docker compose `docker compose up`