Update README.md

Author: rjeczalik

README.md

@@ -1,6 +1,75 @@
 # interfaces [![GoDoc](https://godoc.org/github.com/rjeczalik/interfaces?status.png)](https://godoc.org/github.com/rjeczalik/interfaces) [![Build Status](https://img.shields.io/travis/rjeczalik/interfaces/master.svg)](https://travis-ci.org/rjeczalik/interfaces "linux_amd64") [![Build status](https://img.shields.io/appveyor/ci/rjeczalik/interfaces.svg)](https://ci.appveyor.com/project/rjeczalik/interfaces "windows_amd64")
 Code generation tools for Go's interfaces.
 
+### cmd/structer [![GoDoc](https://godoc.org/github.com/rjeczalik/interfaces/cmd/structer?status.png)](https://godoc.org/github.com/rjeczalik/interfaces/cmd/structer)
+
+Generates a struct for a formatted file. Currently supported formats are:
+
+- CSV
+
+*Usage*
+
+```
+~ $ structer -help
+```
+```
+Usage of structer:
+  -as string
+        Generated struct name. (default "main.Struct")
+  -f string
+        Input file. (default "-")
+  -o string
+        Output file. (default "-")
+  -tag string
+        Name for a struct tag to add to each field.
+  -type string
+        Type of the input, overwrites inferred from file name.
+```
+
+*Example*
+
+```
+~ $ head -2 aws-billing.csv         # first line is a CSV header, second - first line of values
+```
+```
+"InvoiceID","PayerAccountId","LinkedAccountId","RecordType","RecordId","ProductName","RateId","SubscriptionId","PricingPlanId","UsageType","Operation","AvailabilityZone","ReservedInstance","ItemDescription","UsageStartDate","UsageEndDate","UsageQuantity","BlendedRate","BlendedCost","UnBlendedRate","UnBlendedCost","ResourceId"
+"Estimated","54321","54321","LineItem","543212345","AWS CloudTrail","12345","12345","12345","USE1-FreeEventsRecorded","None","","N","0.0 per free event recorded in US East (N.Virginia) region","2016-01-01 00:00:00","2016-01-01 01:00:00","4105.00000000","0.0000000000","0.00000000","0.0000000000","0.00000000",""
+```
+```
+$ structer -f aws-billing.csv -tag json -as billing.Record
+```
+```
+// Created by structer; DO NOT EDIT
+
+package billing
+
+// Record is an struct generated from "aws-billing.csv" file.
+type Record struct {
+        InvoiceID           string  `json:"invoiceID"`
+        PayerAccountID      int64   `json:"payerAccountID"`
+        LinkedAccountID     int64   `json:"linkedAccountID"`
+        RecordType          string  `json:"recordType"`
+        RecordID            float64 `json:"recordID"`
+        ProductName         string  `json:"productName"`
+        RateID              int64   `json:"rateID"`
+        SubscriptionID      int64   `json:"subscriptionID"`
+        PricingPlanID       int64   `json:"pricingPlanID"`
+        UsageType           string  `json:"usageType"`
+        Operation           string  `json:"operation"`
+        AvailabilityZone    string  `json:"availabilityZone"`
+        ReservedInstance    string  `json:"reservedInstance"`
+        ItemDescription     string  `json:"itemDescription"`
+        UsageStartDate      string  `json:"usageStartDate"`
+        UsageEndDate        string  `json:"usageEndDate"`
+        UsageQuantity       float64 `json:"usageQuantity"`
+        BlendedRate         float64 `json:"blendedRate"`
+        BlendedCost         float64 `json:"blendedCost"`
+        UnBlendedRate       float64 `json:"unBlendedRate"`
+        UnBlendedCost       float64 `json:"unBlendedCost"`
+        ResourceID          string  `json:"resourceID"`
+}
+```
+
 ### cmd/interfacer [![GoDoc](https://godoc.org/github.com/rjeczalik/interfaces/cmd/interfacer?status.png)](https://godoc.org/github.com/rjeczalik/interfaces/cmd/interfacer)
 
 Generates an interface for a named type.