Merge pull request #1 from egraphs-good/add-rational

Initialize repo and add `Rational`

Author: Alex-Fischman

.github/CODEOWNERS

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+* @egraphs-good/egglog-reviewers

.github/workflows/build.yml

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+name: Build
+
+on: [push, pull_request, workflow_dispatch]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - run: echo "CARGO_INCREMENTAL=0" >> "$GITHUB_ENV"
+    - uses: actions/checkout@v3
+    - uses: taiki-e/install-action@v2
+      with:
+        tool: nextest
+    - uses: Swatinem/rust-cache@v2
+    - run: make test
+  nits:
+    runs-on: ubuntu-latest
+    steps:
+    - run: echo "CARGO_INCREMENTAL=0" >> "$GITHUB_ENV"
+    - uses: actions/checkout@v3
+    - uses: Swatinem/rust-cache@v2
+    - run: make nits

.gitignore

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+/target