Setup GitHub actions (#97)

* Add a github workflow for testing pywin32-ctypes
* Remove appveyor and codecov setups
* Update test.yaml

Author: itziakos

.github/workflows/test.yaml

@@ -0,0 +1,58 @@
+name: pywin32-ctypes
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  tests:
+    strategy:
+      matrix:
+        python-version: [2.7, 3.3, 3.4, 3.6, 3.7]
+        os: [windows-2019]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+	architecture: 'x64'
+    - name: Test on ${{ matrix.python-version }} 64-bit
+      run: |
+          pip install -q -rtest-requirements.txt
+    	  pip --version
+    	  coverage run -p -m haas -v win32ctypes
+    	  pip install --upgrade cffi
+    	  coverage run -p -m haas -v win32ctypes
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+	architecture: 'x86'
+    - name: test on ${{ matrix.python-version }} 32-bit
+      run: |
+          pip install -q -rtest-requirements.txt
+    	  pip --version
+    	  coverage run -p -m haas -v win32ctypes
+    	  pip install --upgrade cffi
+    	  coverage run -p -m haas -v win32ctypes
+    - uses: actions/upload-artifact@v2
+      with:
+        name: Upload Coverage info
+        path: .coverage*
+  code-lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.6
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.6
+    - name: Install flake8
+      run: python -m pip install flake8
+    - name: Lint codebase
+      run: python -m flake8 win32ctypes/
+