diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..008272a
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,18 @@
+version: 2
+updates:
+  - package-ecosystem: "gomod"
+    commit-message:
+      prefix: "deps:"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "sunday"
+      time: "09:00"
+  - package-ecosystem: "github-actions"
+    commit-message:
+      prefix: "ci:"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "sunday"
+      time: "09:00"
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000..7405eb0
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,17 @@
+name: build
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    - cron: '0 0 * * 0' # run "At 00:00 on Sunday"
+
+# See https://github.com/cristalhq/.github/.github/workflows
+jobs:
+  build:
+    uses: cristalhq/.github/.github/workflows/build.yml@v0.8.1
+
+  vuln:
+    uses: cristalhq/.github/.github/workflows/vuln.yml@v0.8.1
diff --git a/GUIDE.md b/GUIDE.md
new file mode 100644
index 0000000..68fd090
--- /dev/null
+++ b/GUIDE.md
@@ -0,0 +1 @@
+# Guide for osx
diff --git a/README.md b/README.md
index 8cf6cf0..aba5448 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,50 @@
-# osx
\ No newline at end of file
+# osx
+
+[![build-img]][build-url]
+[![pkg-img]][pkg-url]
+[![reportcard-img]][reportcard-url]
+[![coverage-img]][coverage-url]
+[![version-img]][version-url]
+
+TODO
+
+## Features
+
+* Simple API.
+
+See [GUIDE.md](https://github.com/cristalhq/osx/blob/main/GUIDE.md) for more details.
+
+## Install
+
+Go version 1.18+
+
+```
+go get github.com/cristalhq/osx
+```
+
+## Example
+
+```go
+TODO
+```
+
+Also see examples: [example_test.go](https://github.com/cristalhq/osx/blob/main/example_test.go).
+
+## Documentation
+
+See [these docs][pkg-url].
+
+## License
+
+[MIT License](LICENSE).
+
+[build-img]: https://github.com/cristalhq/osx/workflows/build/badge.svg
+[build-url]: https://github.com/cristalhq/osx/actions
+[pkg-img]: https://pkg.go.dev/badge/cristalhq/osx
+[pkg-url]: https://pkg.go.dev/github.com/cristalhq/osx
+[reportcard-img]: https://goreportcard.com/badge/cristalhq/osx
+[reportcard-url]: https://goreportcard.com/report/cristalhq/osx
+[coverage-img]: https://codecov.io/gh/cristalhq/osx/branch/main/graph/badge.svg
+[coverage-url]: https://codecov.io/gh/cristalhq/osx
+[version-img]: https://img.shields.io/github/v/release/cristalhq/osx
+[version-url]: https://github.com/cristalhq/osx/releases
diff --git a/example_test.go b/example_test.go
new file mode 100644
index 0000000..76265b4
--- /dev/null
+++ b/example_test.go
@@ -0,0 +1 @@
+package osx_test
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..1ce01ae
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/cristalhq/osx
+
+go 1.18
diff --git a/osx.go b/osx.go
new file mode 100644
index 0000000..9c51097
--- /dev/null
+++ b/osx.go
@@ -0,0 +1,26 @@
+package osx
+
+import (
+	"os"
+)
+
+// IsFile reports wheter file exists.
+func IsFile(filename string) bool {
+	return exists(filename, false)
+}
+
+// IsDir reports wheter directory exists.
+func IsDir(dirname string) bool {
+	return exists(dirname, true)
+}
+
+func exists(name string, dir bool) bool {
+	switch info, err := os.Stat(name); {
+	case os.IsNotExist(err):
+		return false
+	case dir:
+		return info.IsDir()
+	default:
+		return !info.IsDir()
+	}
+}