CI, readme update

.github/FUNDING.yml

@@ -0,0 +1 @@
+github: [mattmassicotte]

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - 'README.md'
+      - 'CODE_OF_CONDUCT.md'
+      - '.editorconfig'
+      - '.spi.yml'
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    name: Test
+    runs-on: macos-14
+    env:
+      DEVELOPER_DIR: /Applications/Xcode_15.4.app/Contents/Developer
+    strategy:
+      matrix:
+        destination:
+          - "platform=macOS"
+          - "platform=iOS Simulator,name=iPhone 15"
+          - "platform=tvOS Simulator,name=Apple TV"
+          - "platform=watchOS Simulator,name=Apple Watch Series 6 (40mm)"
+          - "platform=macOS,variant=Mac Catalyst"
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Test platform ${{ matrix.destination }}
+        run: set -o pipefail && xcodebuild -scheme Neon -destination "${{ matrix.destination }}" test | xcbeautify

README.md

@@ -1,3 +1,10 @@
+<div align="center">
+
+[![Build Status][build status badge]][build status]
+[![Matrix][matrix badge]][matrix]
+
+</div>
+
 # RelativeCollections
 Swift collection types that support efficient storage of order-relative values
 
@@ -121,10 +128,16 @@ Typically, when faced with this kind of problem you have to measure. Carefully.
 
 ## Contributing and Collaboration
 
-I'd love to hear from you! Get in touch via an issue or pull request.
+I would love to hear from you! Issues or pull requests work great. Both [Matrix][matrix] and [Discord][discord] are available for live help, but I have a strong bias towards answering in the form of documentation.
 
 I prefer collaboration, and would love to find ways to work together if you have a similar project.
 
 I prefer indentation with tabs for improved accessibility. But, I'd rather you use the system you want and make a PR than hesitate because of whitespace.
 
 By participating in this project you agree to abide by the [Contributor Code of Conduct](CODE_OF_CONDUCT.md).
+
+[build status]: https://github.com/ChimeHQ/RelativeCollections/actions
+[build status badge]: https://github.com/ChimeHQ/RelativeCollections/workflows/CI/badge.svg
+[matrix]: https://matrix.to/#/%23chimehq%3Amatrix.org
+[matrix badge]: https://img.shields.io/matrix/chimehq%3Amatrix.org?label=Matrix
+[discord]: https://discord.gg/esFpX6sErJ