Updated dev container Dockerfile and included a docker compose.

nvim/tools/docker-compose.yml

@@ -0,0 +1,9 @@
+version: "3"
+services:
+  nv:
+    container_name: nv
+    image: shaun/neovim:latest
+    user: "1000:1000"
+    restart: unless-stopped
+    volumes:
+      - ~/code:/root/workspace