Add issue templates

**What kind of PR is this?**

Enhancement to GitHub issue templates

**What does does this PR do / why we need it**:

In order to streamline / enhance GitHub bug submission and to direct
users, we must create issue templates to appropriately submit issues.

This PR:
  - Adds descriptions with regards where to ask for support
  (StackOverflow, Slack, documentation) before submitting asking
  developers
  - Adds improvement to the bug report process

**Which issue(s) this PR fixes**:

N/A

**How to test changes / Special notes to the reviewer**:

Yes. Before merging, it's suggested to create the `enhancement` label in
order to appropriately label all incoming enhancement issues.

Signed-off-by: Charlie Drage <charlie@charliedrage.com>

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,23 @@
+---
+name: Bug Report
+about: Report a bug encountered while using Helm
+labels: bug
+
+---
+
+<!-- Please use this template while reporting a bug and provide as much info as possible. Not doing so may result in your bug not being addressed in a timely manner. Thanks!-->
+
+**What happened**:
+
+**What you expected to happen**:
+
+**How to reproduce it (as minimally and precisely as possible)**:
+
+**Anything else we need to know?**:
+
+**Environment**:
+- Helm version (use `helm version`):
+- kubectl version (use `kubectl version`):
+- OS (e.g: `cat /etc/os-release`):
+- Cloud Provider / Platform (AKS, GKE, Minikube, etc.):
+- Others:

.github/ISSUE_TEMPLATE/documentation.md

@@ -0,0 +1,10 @@
+---
+name: Documentation
+about: Report mistakes or request for documentation
+labels: docs
+
+---
+
+## What mistake did you find / what is missing in the documentation?
+
+## What is the relevance of it?

.github/ISSUE_TEMPLATE/enhancement.md

@@ -0,0 +1,11 @@
+---
+name: Request
+about: Suggest an enhancement to Helm
+labels: enhancement
+
+---
+<!-- Please only use this template for submitting enhancement requests -->
+
+**What would you like to be added**:
+
+**Why is this needed**:

.github/ISSUE_TEMPLATE/support.md

@@ -0,0 +1,20 @@
+---
+name: Support Request
+about: Support request or question relating to Helm
+labels: question/support
+
+---
+
+<!--
+!STOP PLEASE READ!
+
+GitHub is NOT the right place for support requests.
+
+If you're looking for help, check:
+- [Stack Overflow](https://stackoverflow.com/questions/tagged/helm) 
+- [Search the official Helm documentation](https://helm.sh/docs)
+- Ask your question on the [Kubernetes Slack](http://slack.k8s.io/) in channel(s) #helm-users, #helm-dev, #charts
+
+If all else fails, open a GitHub issue and a maintainer will triage and direct you to the appropriate support channel.
+
+-->