workflow(issues): update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: 'bug :bug:'
+assignees: ''
+
+---
+
+<!--- Provide a general summary of the issue in the Title above -->
+
+## Your Environment
+<!--- Include as many relevant details about the environment you experienced the bug in -->
+* Version used:
+* Browser Name and version:
+* Operating System and version (desktop or mobile):
+* Link to your project:
+
+## Context
+<!--- Provide a more detailed introduction to the issue itself, and why you consider it to be a bug -->
+<!--- How has this bug affected you? -->
+<!--- If you have errors or a stacktrace in the console, here is a good place to put it. -->
+<!--- Please consider using a pastebin service or create a gist.-->
+<!--- Some screenshots are always greatly appreciated here! -->
+
+
+## Steps to Reproduce
+<!--- Provide a link to a live example, or an unambiguous set of steps to -->
+<!--- reproduce this bug. Include code to reproduce, if relevant -->
+1.
+2.
+3.
+4.
+
+## Expected Behavior
+<!--- Tell us what you think should happen -->
+
+## Actual Behavior
+<!--- Tell us what happens instead of the expected behavior -->
+
+## Possible Cause/Fix/Solution
+<!--- Not obligatory, but suggest a cause or reason for the bug if relevant, -->
+<!--- or ideas how to implement the addition or change -->
+<!--- In any case, please consider opening a PR and become an iTowns developer! -->

.github/ISSUE_TEMPLATE/proposal-request.md

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+---
+name: Proposal request
+about: Suggest an idea for this project
+title: ''
+labels: 'proposal :+1:'
+assignees: ''
+
+---
+
+
+<!--- /!\ IMPORTANT /!\ ONE proposal for ONE and ONLY ONE feature --> 
+
+
+
+<!--- Provide a general summary of the proposal in the Title above -->
+
+This issue is a **feature proposal**. Feel free to upvote (with :+1: ), comment and provide your use-cases if you're interested by this feature.
+
+## Context
+<!--- A description of the feature and why this feature could be interesting to implement in iTowns! -->
+<!--- Current state of iTowns vs. state after implementation -->
+
+
+## Description of the proposal
+<!--- What would this feature looks like in iTowns ? -->
+<!--- Please tell us what you are trying to accomplish -->
+<!--- Providing context helps us come up with a solution that is most useful in the real world -->
+<!--- Could be screenshot of the feature implemented somewhere else or results/stats/poc showing the potential result -->
+
+### Identified use-cases
+<!--- Define in which context this feature could be useful for the user -->
+
+## Implementation
+
+### Functional Implementation
+<!--- Things that should be done in iTowns to implement this feature -->
+
+### Technical Implementation _(optional)_
+<!--- Describe the proposed implementation (PR, pseudo-code and/or diagrams) -->
+
+## Potential Problems
+<!--- Things that could be problematic with this feature or its implementation -->
+
+## Potential Solutions
+<!--- Things that could be done to avoid the mentioned problems -->
+
+## Documentation
+<!--- Links or explanation behind the logic of implementation -->
+<!--- Could be used to implement this feature -->
+<!--- Git Branches / Issues -->