chore: include build dep go-paths-helper.

See #305

pkg/paths/README.md

@@ -0,0 +1,51 @@
+## paths: a golang library to simplify handling of paths
+
+This library aims to simplify handling of the most common operations with paths.
+
+For example code that looked like this:
+
+```go
+buildPath := getPathFromSomewhere() // returns string
+if buildPath != "" {
+	cachePath, err := filepath.Abs(filepath.Join(buildPath, "cache"))
+	...
+}
+```
+
+can be transformed to:
+
+```go
+buildPath := getPathFromSomewhere() // returns *paths.Path
+if buildPath != nil {
+	cachePath, err := buildPath.Join("cache").Abs()
+	...
+}
+```
+
+most operations that usually requires a bit of convoluted system calls are now simplified, for example to check if a path is a directory:
+
+```go
+buildPath := "/path/to/somewhere"
+srcPath := filepath.Join(buildPath, "src")
+if info, err := os.Stat(srcPath); err == nil && !info.IsDir() {
+    os.MkdirAll(srcPath)
+}
+```
+
+using this library can be done this way:
+
+```go
+buildPath := paths.New("/path/to/somewhere")
+srcPath := buildPath.Join("src")
+if !srcPath.IsDir() {
+    scrPath.MkdirAll()
+}
+```
+
+## Security
+
+If you think you found a vulnerability or other security-related bug in this project, please read our
+[security policy](https://github.com/arduino/go-paths-helper/security/policy) and report the bug to our Security Team 🛡️
+Thank you!
+
+e-mail contact: security@arduino.cc