i-1 Introduces an Ansible playbook for linux-container with SSH access

# Issue

This PR implements the following [issue](the-liberated-edge/test-linux-containers#1).

# Acceptance criteria

- [x] A playbook for launching LXD Debian container with parameterized container name and OS version has been implemented.
- [x] The newly launched Linux containers can be connected to and administered via SSH.
- [x] The playbook has been part of an Ansible collection named theliberatededge.test_linux_containers.
- [x] Setup and getting started technical documentation has been added to README.md.

Co-authored-by: emo <esimeonov@gmail.com>
Reviewed-on: #2

playbooks/launch_linux_container.yml

@@ -0,0 +1,8 @@
+---
+- name: launch linux container
+  hosts: localhost
+  gather_facts: false
+  tasks:
+    - name: Create a test container image template
+      ansible.builtin.import_role:
+        name: linux_container