docker installation instructions

README.md

@@ -1,6 +1,18 @@
 # music bot
 ## try for yourself
 default prefix is `?/`
+### install docker compose
+follow instructions at https://docs.docker.com/compose/install/  
+from https://docs.docker.com/compose/install/ :
+```sh
+sudo apt-get update
+sudo apt-get install docker-compose-plugin
+```
+or
+```sh
+sudo yum update
+sudo yum install docker-compose-plugin
+```
 ### clone repo
 ```sh
 git clone https://gitea.parrrate.ru/PTV/v6d3music.git