Misc. cleanup for project setup (python-poetry#1)

* ci: fix branch configuration

* readme: add initial content

* add .gitignore

* add code quality checks managed by pre-commit

.flake8

@@ -0,0 +1,3 @@
+[flake8]
+max-line-length = 88
+ignore = E501, E203, W503

.github/workflows/code-quality.yaml

@@ -0,0 +1,15 @@
+name: Code Quality
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+jobs:
+  pre-commit:
+    name: Linting
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-python@v2
+    - uses: pre-commit/[email protected]

.github/workflows/installer.yml

@@ -6,7 +6,7 @@ on:
       - 'install-poetry.py'
       - '.github/workflows/installer.yml'
     branches:
-      - master
+      - main
   pull_request:
     paths:
       - 'install-poetry.py'