Add CI via Cirrus-ci.org

Author: asomers

.cirrus.yml

@@ -0,0 +1,21 @@
+freebsd_instance:
+  image: freebsd-11-2-release-amd64
+
+task:
+  name: cargo test
+  # Record some info about the test environment
+  sysinfo_script:
+    - mount
+    - df -h
+    - sysctl hw.model hw.ncpu hw.physmem
+    - freebsd-version
+  # Install Rust
+  setup_script:
+    - pkg install -y curl
+    - curl https://sh.rustup.rs -sSf --output rustup.sh
+    - sh rustup.sh -y
+    # In 11.2, aio on ufs is considered unsafe
+    - sysctl vfs.aio.enable_unsafe=1
+  test_script:
+    - . $HOME/.cargo/env
+    - cargo test

README.md

@@ -3,6 +3,8 @@
 A library for integrating file I/O with [tokio].  File I/O can be seamlessly
 mixed with all other Future types within the Tokio reactor.
 
+[![Build Status](https://api.cirrus-ci.com/github/asomers/tokio-file.svg)](https://cirrus-ci.com/github/asomers/tokio-file)
+
 [tokio]: https://github.com/tokio-rs/tokio-core
 
 ```toml