Add github actions for issue tracker

Author: pjotrp

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report 🐞
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+---
+**Only bug reports!**
+
+The C++ version of VCFLIB is in *maintenance* mode. Use the github issue
+tracker to report bugs *only*. For comments, questions and features,
+please use the google group mailing list as stated on the
+[README](https://github.com/vcflib/vcflib/blob/master/README.md)!
+
+**Describe the bug**
+
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+
+Include all steps to reproduce the behavior and paste any complete
+errors from the terminal.
+
+**Expected behavior**
+
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+
+Add any other context about the problem here.
+
+Include a set of VCF files to reproduce the issue
+
++ bonus points if you try to minimize the test case yourself, as issues are often localized:
+  - try to use sambamba or samtools slice to first extract the reference where the error occurs
+  - if that succeeds (the error is still reproducible), continue to crop the file in binary-search fashion
+
+**Finally**
+
+Please check the README and docs carefully. Everyone working on vcflib is doing that for free. Please respect our time (too).

.github/workflows/issue-tracker-bot.yaml

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+name: "Close stale issues"
+on:
+  schedule:
+    - cron: "0 * * * *"
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v3
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          stale-issue-message: 'This issue is marked stale because it has been open 120 days with no activity. Remove stale label or comment or this will be closed in 5 days'
+          close-issue-message: 'This issue was closed for lack of activity. Feel free to re-open if someone feels like working on it.'
+          days-before-stale: 120
+          days-before-close: 5
+          exempt-issue-labels: "bug,build,enhancement,help wanted,in progress"
+          debug-only: false
+          operations-per-run: 100 	

.github/workflows/main.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: CI
+
+# Controls when the action will run. 
+on:
+  # Triggers the workflow on push or pull request events but only for the master branch
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+
+      # Runs a single command using the runners shell
+      - name: Run a one-line script
+        run: echo Hello, world!
+
+      # Runs a set of commands using the runners shell
+      - name: Run a multi-line script
+        run: |
+          echo Add other actions to build,
+          echo test, and deploy your project.