added harvester code

ansible/roles/harvester-build/defaults/main.yaml

+---
+    harvester_dir: harvester
\ No newline at end of file

ansible/roles/harvester-build/tasks/main.yaml

+---
+- name: Install Tweepy
+  tags: 'harvester'
+  become: yes
+  pip:
+    name: tweepy
+
+- name: Create Harvester directory
+  tags: 'harvester'
+  become: yes
+  file:
+    path: "{{ harvester_dir }}"
+    owner: "{{ ansible_user }}"
+    group: "{{ ansible_user }}"
+    recurse: yes
+    state: directory
+
+  # TO BE COMPLETED
+- name: Copy harvester
+  tags: 'harvester'
+  become: yes
+  template:
+    src: docker-compose.yaml.j2
+    dest: "{{ harvester_dir }}/docker-compose.yaml"
+    owner: "{{ ansible_user }}"
+    group: "{{ ansible_user }}"
+
+- name: Run harvester
+  tags: 'harvester'
+  become: yes