Add readme and drone CI/CD

.drone.yml

@@ -18,5 +18,3 @@ steps:
   when:
     branch: main
     event: push
-
-

README.md

@@ -1,3 +1,40 @@
 # discord-biketag
 
-A manual bot for biketag
+A manual bot for biketag
+
+## Install it
+
+Clone this repository.  
+Run `db.sql` in PostgreSQL.  
+You can run this project in docker or in standalone.  
+
+### Standalone mode : 
+
+Create a file called config.yml in `src/` with this info : 
+```yaml
+db:
+  host: 127.0.0.1
+  port: 5432
+  dbname: biketag
+  user: biketag
+  password: 
+discord:
+  token: 
+  app_id:
+  guild_id: 
+``` 
+
+or source environment variable like docker mode
+
+### Docker mode 
+
+| Environment | Value |
+|-------------|-------|
+| DB_HOST     | Your database host  |
+| DB_PORT     | Your database port      |
+| DB_NAME     | Your database name      |
+| DB_USER     | Your database username      |
+| DB_PASS     | Your database password      |
+| DISCORD_TOKEN     | Your Discord bot token      |
+| DISCORD_APP_ID     | Your Discord Application ID      |
+| DISCORD_GUILD_ID     | Your guild ID      |