feat: add root-level doc.go for Go Report Card compatibility

- Add package documentation at repository root
- Enables Go Report Card to recognize the repository as a Go project
- Provides package-level documentation and usage examples
- Fixes 'no .go files found' error from Go Report Card

Author: 0xdps

doc.go

@@ -0,0 +1,23 @@
+// Package fakestack provides tools for generating realistic fake data and populating databases.
+//
+// Fakestack is a high-performance database generator with realistic fake data.
+// It supports multiple databases (SQLite, MySQL, PostgreSQL, MariaDB, MSSQL, CockroachDB)
+// and provides 116+ generators for creating test data.
+//
+// The main functionality is implemented in the golang subdirectory.
+// For CLI usage, build and run the binary from golang/main.go
+// For library usage, import github.com/0xdps/fake-stack/golang/pkg/generator
+//
+// Example:
+//
+//	import "github.com/0xdps/fake-stack/golang/pkg/generator"
+//
+//	gen := generator.New()
+//	fields := []generator.Field{
+//	    {Name: "username", Generator: "username"},
+//	    {Name: "email", Generator: "email"},
+//	}
+//	records, err := gen.GenerateRecords(fields, 10)
+//
+// For more information, visit: https://github.com/0xdps/fake-stack
+package fakestack