Initial (soft) release of Balter

Rebasing previous commits to hide the mess.

.envrc

@@ -0,0 +1 @@
+use_nix

.github/workflows/rust.yml

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+name: CI
+
+on:
+  push:
+    branches: ['main']
+  pull_request:
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Format
+      run: cargo fmt --all -- --check
+    - name: Clippy
+      run: cargo clippy --all-targets -- -D warnings
+    - name: Build
+      run: cargo build --verbose
+    - name: Run tests
+      run: cargo test --verbose

.gitignore

@@ -0,0 +1,3 @@
+/target
+playground/
+notes.md