Create EEP0012-Use_Case_Proposal_Template.md

This PR proposes to create a Use Case Template.
It is based on [Issue#12](#12)

draft/templates/EEP0012-Use_Case_Proposal_Template.md

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+    EEP: 0012
+    Title: Use Case Proposal Template
+    Author: Joaquin Prado
+    Type: Process
+    Status: Draft
+    Working Group: Process
+    Created: 2017-11-12
+    Requires (*optional): N/A
+    Replaces (*optional): N/A
+
+# What is an Use Case   
+``` 
+A Use Case document describes commercial requirements a very high-level. It contains a list of actions or events steps typically defining
+the interactions between a role (actor) and a system to achieve a goal. The actor can be a human or other external system.
+
+The analysis of the Use Case will identify the requirements of the system under desing. information contained in Use Case will be used to derive technical requirements.
+TO BE DELETED.
+```
+# Use Case Rationale
+```
+This template is intended to collect the primary information of a new feature. The information listed here will be used to create a set of technical requirements, which will be formalized in EEP-0013-Requirements_Proposal_Template.md. It is possible to merge these two templates "EEP-0012-Use_Case_Proposal_Template.md" and "EEP-0013-Requirements_Proposal_Template.md" a later stage.
+TO BE DELETED.
+```
+
+# Use Case Title (write your title here)
+```
+The level of detail of descriptions shall be above technical implementations of protocols.
+The sub-sections below should consist of one or two sentences.
+TO BE DELETED.
+```
+
+# Brief Description
+```
+A brief paragraph of text describing the scope of the use case.
+TO BE DELETED.
+```
+Write your brief description here ...
+
+# Actor
+```
+A list of the types of users who can engage in the activities described in the use case. Actor names should not correspond to job titles.
+TO BE DELETED.
+```
+List all the actors here ...
+
+# Preconditions
+```
+Anything the solution can assume to be true when the use case begins.
+TO BE DELETED.
+```
+Set your preconditions here ...
+
+# Basic Flow
+```
+The set of steps the actors take to accomplish the goal of the use case. A clear description of what the system does in response to each user action.
+TO BE DELETED.
+```
+Set your basic flow here ...
+
+# Alternate Flows
+```
+Capture the less common user/system interactions, such as being on a new computer and answering a security question.
+TO BE DELETED.
+```
+Define your alternate flows here ...
+
+# Exception Flows
+```
+The things that can happen that prevent the user from achieving their goal, such as providing an incorrect username and password.
+TO BE DELETED.
+```
+Define your exception flows here ...
+
+# Post Conditions
+```
+Anything that must be true when the use case is complete.
+TO BE DELETED.
+```
+Set the post conditions here ...
+