add github action

Author: gcanti

.github/ISSUE_TEMPLATE/Bug_report.md

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+---
+name: "\U0001F41B Bug report"
+about: Create a report to help make parser-ts better
+---
+
+## 🐛 Bug report
+
+### Current Behavior
+
+<!-- If applicable, add screenshots to help explain your problem. -->
+
+### Expected behavior
+
+<!-- A clear and concise description of what you expected to happen. -->
+
+### Reproducible example
+
+### Suggested solution(s)
+
+<!-- How could we solve this bug? What changes would need to made to parser-ts? -->
+
+### Additional context
+
+<!-- Add any other context about the problem here.  -->
+
+### Your environment
+
+Which versions of parser-ts are affected by this issue? Did this work in previous versions of parser-ts?
+
+<!-- PLEASE FILL THIS OUT -->
+
+| Software   | Version(s) |
+| ---------- | ---------- |
+| fp-ts      |            |
+| parser-ts  |            |
+| TypeScript |            |

.github/ISSUE_TEMPLATE/Documentation.md

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+---
+name: "\U0001F41B Documentation"
+about: Improvements or suggestions of parser-ts documentation
+---
+
+## 📖 Documentation

.github/ISSUE_TEMPLATE/Feature_request.md

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+---
+name: "\U0001F680Feature request"
+about: Suggest an idea for parser-ts
+---
+
+## 🚀 Feature request
+
+### Current Behavior
+
+<!-- A clear and concise description of what is the current behavior / use.  -->
+
+### Desired Behavior
+
+<!-- A clear and concise description of what you want to happen.  -->
+
+### Suggested Solution
+
+<!-- Suggest a solution that the community/maintainers/you may take to enable the desired behavior  -->
+
+<!-- NOTE: Feature Requests without suggested solutions may not be addressed or treated with the same level of urgency as those that have suggested solutions. -->
+
+### Who does this impact? Who is this for?
+
+<!-- Who is this for? All users? TypeScript users? Beginners? Advanced? Yourself? People using X, Y, X, etc.? -->
+
+### Describe alternatives you've considered
+
+<!-- A clear and concise description of any alternative solutions or features you've considered.  -->
+
+### Additional context
+
+<!-- Add any other context or links about the feature request here. -->
+
+### Your environment
+
+<!-- PLEASE FILL THIS OUT -->
+
+| Software   | Version(s) |
+| ---------- | ---------- |
+| fp-ts      |            |
+| parser-ts  |            |
+| TypeScript |            |

.github/PULL_REQUEST_TEMPLATE.md

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+**Before submitting a pull request,** please make sure the following is done:
+
+- Fork [the repository](https://github.com/gcanti/parser-ts) and create your branch from `master`.
+- Run `npm install` in the repository root.
+- If you've fixed a bug or added code that should be tested, add tests!
+- Ensure the test suite passes (`npm test`).
+
+**Note**. If you've fixed a bug please link the related issue or, if missing, open an issue before sending a PR.
+
+**Note**. If you find a typo in the **documentation**, make sure to modify the corresponding source (docs are generated).

.github/workflows/main.yml

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+name: Node.js CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [12.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: npm install
+    - run: npm run build --if-present
+    - run: npm test