feat(repo): create issue templates to help organize issues (nrwl#3061)

.github/ISSUE_TEMPLATE/1-bug.md

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+---
+name: "🐞 Bug Report"
+about: Report Current Behavior that is believed to be unintentional or unexpected.
+labels: "type: bug"
+
+---
+
+<!-- Please do your best to fill out all of the sections below! -->
+
+## Current Behavior
+<!-- What is the behavior that currently you experience? -->
+
+## Expected Behavior
+<!-- What is the behavior that you expect to happen? -->
+<!-- Is this a regression? .i.e Did this used to be the behavior at one point?  -->
+
+## Steps to Reproduce
+<!-- Help us help you by making it easy for us to reproduce your issue! -->
+
+<!-- Can you reproduce this on https://github.com/nrwl/nx-examples? -->
+<!-- If so, open a PR with your changes and link it below. -->
+<!-- If not, please provide a minimal Github repo -->
+<!-- At the very least, provide as much detail as possible to help us reproduce the issue -->
+
+<!-- Remove this line -->
+This issue may not be prioritized if details are not provided to help us reproduce the issue.
+
+### Failure Logs
+<!-- Please include any relevant log snippets or files here. -->
+
+### Environment
+<!-- It's important for us to know the context in which you experience this behavior! -->
+<!-- Please paste the result of `nx report` below! -->

.github/ISSUE_TEMPLATE/2-feature.md

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+---
+name: "\U0001F680 Feature Request"
+about: Request Behavior that does not currently exist in Nx
+labels: "type: feature"
+
+---
+
+<!-- Please do your best to fill out all of the sections below! -->
+
+## Description
+<!-- What is the behavior that you would like to see introduced? -->
+
+## Motivation
+<!-- Why do you believe this behavior would be beneficial? -->
+
+## Suggested Implementaion
+<!-- How do you imagine this might work? -->
+
+## Alternate Implementations
+<!-- How else do you imagine this might work. -->

.github/ISSUE_TEMPLATE/3-discussion.md

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+---
+name: "💡  Discussion"
+about: "Start a thread to discuss an idea"
+labels: "type: question / discussion"
+
+---
+
+<!-- Please do your best to fill out all of the sections below! -->
+
+## Description
+<!-- What would you like to discuss? -->

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Read the Community Guidelines
+    about: "Please make sure you have read the submission guidelines before posting an issue"
+    url: https://github.com/nrwl/nx/blob/master/CONTRIBUTING.md#-submitting-an-issue
+  - name: Have a question?
+    url: https://join.slack.com/t/nrwlcommunity/shared_invite/enQtNzU5MTE4OTQwOTk0LTgxY2E0ZWYzMWE0YzA5ZDA2MWM1NDVhNmI2ZWMyYmZhNWJiODk3MjkxZjY3MzU5ZjRmM2NmNWU1OTgyZmE4Mzc
+    about: "The Community Slack is a great place for questions to be asked and answered. Please use the #support channel if you need help with your workspace!"
+  - name: Are you looking for integration with a new tool?
+    url: https://nx.dev/nx-community
+    about: "There are a lot of awesome Plugins for Nx provided by the community! Check here to see if there is a community plugin to integrate your tool."

.github/PULL_REQUEST_TEMPLATE/PULL_REQUEST_TEMPLATE.md

@@ -1,11 +1,16 @@
-_[Please make sure you have read the submission guidelines before posting an PR](https://github.com/nrwl/nx/blob/master/CONTRIBUTING.md#submit-pr)_
+<!-- Please make sure you have read the submission guidelines before posting an PR -->
+<!-- https://github.com/nrwl/nx/blob/master/CONTRIBUTING.md#-submitting-a-pr -->
 
-> _Please make sure that your commit message follows our format._
+<!-- Please make sure that your commit message follows our format -->
+<!-- Example: `fix(nx): must begin with lowercase` -->
 
-> Example: `fix(nx): must begin with lowercase`
+## Current Behavior
+<!-- This is the behavior we have today -->
 
-## Current Behavior (This is the behavior we have today, before the PR is merged)
+## Expected Behavior
+<!-- This is the behavior we should expect with the changes in this PR -->
 
-## Expected Behavior (This is the new behavior we can expect after the PR is merged)
+## Related Issue(s)
+<!-- Please link the issue being fixed so it gets closed when this is merged. -->
 
-## Issue
+Fixes #