Add GitHub issue templates (nektos#512)

Author: Cat™

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Ask on Gitter
+    url: https://gitter.im/nektos/act
+    about: You can ask for help here!
+  - name: Want to contribute to act?
+    url: https://github.com/nektos/act/blob/master/CONTRIBUTING.md
+    about: Be sure to read contributing guidelines!

.github/ISSUE_TEMPLATE/feature_template.md

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+---
+name: Feature request
+about: Use this template for requesting a feature/enhancement.
+title: "Enhancement: "
+labels: "kind/feature-request"
+assignees: ''
+---
+
+## Describe feature

.github/ISSUE_TEMPLATE/issue_template.md

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+---
+name: Issue
+about: Use this template for reporting a bug/issue.
+title: "Issue: "
+labels: kind/bug
+assignees: ''
+---
+
+<!--
+- Make sure you are able to reproduce it on the [latest version](https://github.com/nektos/act/releases)
+- Search the existing issues.
+- Refer to [README](https://github.com/nektos/act/blob/master/README.md).
+-->
+
+## Act version
+
+<!-- Paste output of `act --version` -->
+
+```none
+
+```
+
+## Expected behaviour
+
+<!-- Describe how whole process should go and finish -->
+
+## Actual behaviour
+
+<!-- Describe what happened -->
+
+## Workflow and/or repository
+
+<details>
+  <summary>workflow</summary>
+
+```none
+name: example workflow
+
+on: [push]
+
+jobs:
+  [...]
+```
+
+</details>
+
+## Steps to reproduce
+
+<!--
+Make sure to include command you used to run `act`
+e.g.:
+1. Clone example repo (https://github.com/cplee/github-actions-demo)
+2. Enter cloned repo directory
+3. Run `act -s SUPER_SECRET=im-a-value`
+-->
+
+
+## `act` output
+
+<!-- Paste output from your terminal, use `-v` or `--verbose` for richer output -->
+
+<details>
+  <summary>Log</summary>
+
+```none
+
+```
+
+</details>