Merge pull request #44 from opentracing/36_adds_issue_and_pr_templates

[#36] Adds issue and PR templates.

.github/ISSUE_TEMPLATE.md

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+<!--
+Welcome to the OpenTracing PHP repo! 👋🎉
+
+- Please search for existing issues in order to ensure we don't have duplicate bugs/feature requests.)
+- Please be respectful and considerate of others when commenting on issues)
+- Please provide as much information as possible so we all understand the issue.)
+- Please don't ask questions here. If you have any question head to our gitter chat https://gitter.im/opentracing/opentracing-php
+-->
+
+
+## Background
+Something that gives context about why this is an issue.
+
+## Problem
+Describe the problem. If the issue is about an improvement you can skip this. If possible, include a description of the impact of the problem.
+
+## Proposal
+A proposal that from your POV would solve the problem or improve the existing situation. It should also include the impact.
+
+## Questions to address
+Questions that should be answered as outcome of this issue.

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+We appreciate the effort for this pull request but before that please make sure you read the contribution guidelines given above, then fill out the blanks below.
+
+Please don't open huge pull requests and keep one pull request solving one problem.
+
+Please enter the issue number you are resolving in your PR after one of the following words [Fixes, Closes, Resolves]. This will auto-link these issues and close them when this PR is merged!
+e.g. 
+Fixes #1
+Closes #2
+-->
+# Fixes # 
+
+### Checklist
+- [ ] I have made a material change to the repo (functionality, testing, spelling, grammar)
+- [ ] I have read the [Contribution Guide] and my PR follows them.
+- [ ] I updated my branch with the master branch.
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] I have added necessary documentation about the functionality in the appropriate .md file
+- [ ] I have added in line documentation to the code I modified
+
+### Short description of what this PR does:
+- 
+-