Merge pull request 'Creating new Playbooks and roles' (#1) from docs/roles-playbooks into master

Reviewed-on: #1
Reviewed-by: Shah Ismail <shah@smarticlelabs.com>

Creating-new-playbook.md

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+#New playbook
+
+##### Create new playbook only if you see there is an independent task that must be performed on node
+
+**Content of playbook**
+
+1. Host
+    Mention all nodes of which you want this playbook to run
+2. Vars
+    If you want to use any variables in current playbook you may introduce them here
+3. Tasks
+    Series of tasks can be provided but, it is recommended to add tasks in Roles and use those roles in current playbook
+4. Roles
+    Roles are to be created when we have found a sub independent task and those roles can become part of playbook
+

Creating-new-role.md

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+#New Role
+
+#### Once you are super sure you find a sub module and its independent you can create a Role for it that can be used in different playbooks
+
+**Directory structure**
+
+1. Defaults:-
+    Here we need to define all vars in ``main.yml`` that will be used later on in this role
+2. Files:-
+    Here we put all those files which are related to role's business requirements, like we want to ran a docker container or setup a nginx server and all supporting files will be here
+3. Tasks:-
+    All doable tasks will be here by default all tasks in ``main.yml`` are defined here
+4. Templates:-
+    This is the directory which is responsible for generating files during run time, also behaves like a bridge.
+5. .travis.yml:-
+    In this file we define all the dependencies of current role. 
+