Update doc.go and README.md.

doc.go

@@ -1,5 +1,74 @@
 /*
-Package jet is a framework for writing type-safe SQL queries for PostgreSQL in Go, with ability
-to easily convert database query result to desired arbitrary structure.
+Package jet is a framework for writing type-safe SQL queries in Go, with ability to easily convert database query
+result into desired arbitrary object structure.
+
+
+Installation
+
+
+Use the bellow command to install jet
+	$ go get -u github.com/go-jet/jet
+
+Install jet generator to GOPATH bin folder. This will allow generating jet files from the command line.
+	go install github.com/go-jet/jet/cmd/jet
+
+*Make sure GOPATH bin folder is added to the PATH environment variable.
+
+Usage
+
+Jet requires already defined database schema(with tables, enums etc), so that jet generator can generate SQL Builder
+and Model files. File generation is very fast, and can be added as every pre-build step.
+Sample command:
+	jet -source=PostgreSQL -host=localhost -port=5432 -user=jet -password=pass -dbname=jetdb -schema=dvds -path=./gen
+
+Then next step is to import generated SQL Builder and Model files and write SQL queries in Go:
+	import . "some_path/.gen/jetdb/dvds/table"
+	import "some_path/.gen/jetdb/dvds/model"
+
+To write SQL queries for PostgreSQL import:
+	. "github.com/go-jet/jet/postgres"
+
+To write SQL queries for MySQL and MariaDB import:
+	. "github.com/go-jet/jet/mysql"
+*Dot import is used so that Go code resemble as much as native SQL. Dot import is not mandatory.
+
+Write SQL:
+	// sub-query
+	rRatingFilms := SELECT(
+				Film.FilmID,
+				Film.Title,
+				Film.Rating,
+			).
+			FROM(Film).
+			WHERE(Film.Rating.EQ(enum.FilmRating.R)).
+			AsTable("rFilms")
+
+	// export column from sub-query
+	rFilmID := Film.FilmID.From(rRatingFilms)
+
+	// main-query
+	query := SELECT(
+			Actor.AllColumns,
+			FilmActor.AllColumns,
+			rRatingFilms.AllColumns(),
+		).
+		FROM(
+			rRatingFilms.
+			INNER_JOIN(FilmActor, FilmActor.FilmID.EQ(rFilmID)).
+			INNER_JOIN(Actor, Actor.ActorID.EQ(FilmActor.ActorID)
+		).
+		ORDER_BY(rFilmID, Actor.ActorID)
+
+Store result into desired destination:
+	var dest []struct {
+		model.Film
+
+		Actors []model.Actor
+	}
+
+	err := query.Query(db, &dest)
+
+Detail info about all features and use cases can be
+found at project wiki page - https://github.com/go-jet/jet/wiki.
 */
 package jet