Add steps to clean up service provider setup (#14)

Part of [Service Provider Setup](https://www.notion.so/Service-provider-setup-a09e2207e1f34f3a847f7ce9713b7ac5)
- Move user setup playbook to separate directory
- Remove unneeded variables

Co-authored-by: Adw8 <adwaitgharpure@gmail.com>
Reviewed-on: cerc-io/testnet-ops#14

user-setup/.gitignore

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+user-vars.yml

user-setup/README.md

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+# user-setup
+
+## Prerequisites
+
+- Setup Ansible: follow the [installation](../README.md#installation) guide to setup ansible on your machine.
+
+- Setup a remote machine with passwordless SSH login for the root user
+
+- Install `passlib` used for handling encrypted passwords when setting up a user
+
+  ```bash
+  pip install passlib
+  ```
+
+## Setup a user
+
+- Create a new `hosts.ini` file:
+
+   ```bash
+   cd user-setup/
+   cp ../hosts.example.ini hosts.ini
+   ```
+
+- Edit the [`hosts.ini`](./hosts.ini) file:
+
+  ```ini
+  [deployment_host]
+  <host_name> ansible_host=<target_ip> ansible_user=<ssh_user> ansible_ssh_common_args='-o ForwardAgent=yes'
+  ```
+
+  - Replace `<host_name>` with the desired `hostname` of the remote machine
+  - Replace `<target_ip>` with the IP address or hostname of the target machine
+  - Replace `<ssh_user>` with `root`
+
+- Verify that you are able to connect to the host using the following command:
+
+  ```bash
+  ansible all -m ping -i hosts.ini
+
+  # Expected output:
+
+  # <host_name> | SUCCESS => {
+  #  "ansible_facts": {
+  #      "discovered_interpreter_python": "/usr/bin/python3.10"
+  #  },
+  #  "changed": false,
+  #  "ping": "pong"
+  # }
+  ```
+
+- Setup `user-vars.yml`  using the example file
+
+  ```bash
+  cp user-vars.example.yml user-vars.yml
+  ```
+
+- Edit the `user-vars.yml` file:
+
+  ```bash
+  # name of the user you want to setup on the target host
+  username: ""
+
+  # password of the user you want to setup on the target host
+  password: ""
+
+  # path to the ssh key on your machine, eg: "/home/user/.ssh/id_rsa.pub"
+  path_to_ssh_key: ""
+  ```
+
+- Execute the `setup-user.yml` Ansible playbook to create a user with passwordless sudo permissions:
+
+  ```bash
+  LANG=en_US.utf8 ansible-playbook setup-user.yml -i hosts.ini
+  ```

user-setup/setup-user.yml

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+- name: Configure system
+  hosts: deployment_host
+  become: yes
+
+  vars_files:
+    - user-vars.yml
+
+  tasks:
+    - name: Create a user
+      user:
+        name: "{{ username }}"
+        password: "{{ '{{ password }}' | password_hash('sha512') }}"
+        shell: /bin/bash
+        state: present
+
+    - name: Add user to sudoers group
+      user:
+        name: "{{ username }}"
+        groups: sudo
+        append: yes
+
+    - name: Ensure .ssh directory exists for user
+      file:
+        path: /home/{{ username }}/.ssh
+        state: directory
+        owner: "{{ username }}"
+        group: "{{ username }}"
+        mode: '0700'
+
+    - name: Append SSH public key to authorized_keys
+      lineinfile:
+        path: /home/{{ username }}/.ssh/authorized_keys
+        line: "{{ lookup('file', path_to_ssh_key) }}"
+        create: yes
+        owner: "{{ username }}"
+        group: "{{ username }}"
+        mode: '0600'
+        state: present
+
+    - name: Add user to sudoers for passwordless sudo
+      lineinfile:
+        path: /etc/sudoers
+        state: present
+        regexp: '^{{ username }} ALL=\(ALL\) NOPASSWD:ALL'
+        line: '{{ username }} ALL=(ALL) NOPASSWD:ALL'
+        validate: 'visudo -cf %s'

user-setup/user-vars.example.yml

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+username: ""
+password: ""
+path_to_ssh_key: ""