diff --git a/core/doc.go b/core/doc.go
new file mode 100644
index 0000000..d50f0ec
--- /dev/null
+++ b/core/doc.go
@@ -0,0 +1,96 @@
+// Use of this source code is governed by a MIT
+// license that can be found in the LICENSE file.
+
+/*
+Package core provides different functions like error-reporting, logging, localization, etc. in order to make it easier to create transports.
+Usage:
+	package main
+
+	import (
+	    "os"
+	    "fmt"
+	    "html/template"
+
+	    "github.com/gin-gonic/gin"
+	    "github.com/gobuffalo/packr/v2"
+	    "github.com/retailcrm/mg-transport-core/core"
+	)
+
+	func main() {
+	    app := core.New()
+	    app.Config = core.NewConfig("config.yml")
+	    app.DefaultError = "unknown_error"
+	    app.TranslationsPath = "./translations"
+
+	    app.ConfigureRouter(func(engine *gin.Engine) {
+	        engine.Static("/static", "./static")
+	        engine.HTMLRender = app.CreateRenderer(
+	            func(renderer *core.Renderer) {
+	                // insert templates here. Example:
+	                r.Push("home", "templates/layout.html", "templates/home.html")
+	            },
+	            template.FuncMap{},
+	        )
+	    })
+
+	    if err := app.Prepare().Run(); err != nil {
+	        fmt.Printf("Fatal error: %s", err.Error())
+	        os.Exit(1)
+	    }
+	}
+
+Resource embedding
+
+packr can be used to provide resource embedding, see:
+	https://github.com/gobuffalo/packr/tree/master/v2
+In order to use packr you must follow instruction, and provide boxes with templates, translations and assets to library.
+You can find instruction here:
+	https://github.com/gobuffalo/packr/tree/master/v2#library-installation
+Example of usage:
+	package main
+
+	import (
+	    "os"
+	    "fmt"
+	    "html/template"
+
+	    "github.com/gin-gonic/gin"
+	    "github.com/gobuffalo/packr/v2"
+	    "github.com/retailcrm/mg-transport-core/core"
+	)
+
+	func main() {
+	    static := packr.New("assets", "./static")
+	    templates := packr.New("templates", "./templates")
+	    translations := packr.New("translations", "./translate")
+
+	    app := core.New()
+	    app.Config = core.NewConfig("config.yml")
+	    app.DefaultError = "unknown_error"
+	    app.TranslationsBox = translations
+
+	    app.ConfigureRouter(func(engine *gin.Engine) {
+	        engine.StaticFS("/static", static)
+	        engine.HTMLRender = app.CreateRendererFS(
+	            templates,
+	            func(renderer *core.Renderer) {
+	                // insert templates here. Example:
+	                r.Push("home", "layout.html", "home.html")
+	            },
+	            template.FuncMap{},
+	        )
+	    })
+
+	    if err := app.Prepare().Run(); err != nil {
+	        fmt.Printf("Fatal error: %s", err.Error())
+	        os.Exit(1)
+	    }
+	}
+
+Migration generator
+
+This library contains helper tool for transports. You can install it via go:
+	$ go get -u github.com/retailcrm/mg-transport-core/cmd/transport-core-tool
+Currently, it only can generate new migrations for your transport.
+*/
+package core