feat(chore): using Github templates for issues and PRs (#610)

Let's make our life a little easier using those templates.

See https://help.github.com/en/github/building-a-strong-community/about-issue-and-pull-request-templates for reference.

Author: StephenSorriaux

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,31 @@
+---
+name: Bug Report
+about: Report a bug encountered while using Kazoo
+
+---
+
+<!-- Please use this template while reporting a bug and provide as much info as possible. Thank you.-->
+
+
+## Expected Behavior
+
+
+## Actual Behavior
+
+
+## Snippet to Reproduce the Problem
+
+```COPY/PASTE the snippet here (omit any sensitive information)```
+
+## Logs with logging in DEBUG mode
+
+```COPY/PASTE the result of the snippet here (omit any sensitive information)```
+
+## Specifications
+
+  - Kazoo version:
+  - Result of `pip list` command: 
+  - Zookeeper version:
+  - Zookeeper configuration: put here any useful ZK configuration (authentication, encryption, number of ZK members, number of (concurrent?) clients, Java version, krb5 version, etc.)
+  - Python version:
+  - OS:

.github/ISSUE_TEMPLATE/enhancement.md

@@ -0,0 +1,13 @@
+---
+name: Enhancement Request
+about: Suggest an enhancement for Kazoo
+
+---
+
+<!-- Please only use this template for submitting enhancement requests -->
+
+## What would you like to be added
+
+
+## Why is this needed
+

.github/PULL_REQUEST_TEMPLATE.md

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+Fixes #
+
+## Why is this needed?
+
+## Proposed Changes
+
+  - change 1
+  - change 2
+  - ...
+
+## Does this PR introduce any breaking change?
+