Add some basic CI and metadata

.github/workflows/main.yml

@@ -0,0 +1,34 @@
+name: CI
+on:
+  pull_request:
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  test:
+    name: Test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        include:
+        - os: ubuntu-latest
+        - os: macos-latest
+        - os: windows-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: true
+    - run: cargo test
+
+  msrv:
+    name: MSRV
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: true
+    - run: rustup update 1.60.0 && rustup default 1.60.0
+    - run: cargo test
+

Cargo.toml

@@ -9,3 +9,8 @@ description = """
 Tool for helping to find SSL certificate locations on the system for OpenSSL
 """
 readme = "README.md"
+edition = '2021'
+
+# This was arbitrarily chosen on 2025-01-23 as "pretty old" as previously
+# key didn't exist in `Cargo.toml` prior to that.
+rust-version = '1.60.0'