add license and readme

Author: makasim

LICENSE

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+MIT License
+
+Copyright (c) 2022 Max Kotliar
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# TCP based JSON RPC 1.0 Client\Server
+
+The package combines TCP connections management from (valyala/fasthttp)[https://github.com/valyala/fasthttp] and
+Go's standard [jsonrpc codec](https://pkg.go.dev/net/rpc/jsonrpc).
+
+Here is a simple example. A server wishes to export an object of type Arith:
+
+```go
+package server
+
+import "errors"
+
+type Args struct {
+	A, B int
+}
+
+type Quotient struct {
+	Quo, Rem int
+}
+
+type Arith int
+
+func (t *Arith) Multiply(args *Args, reply *int) error {
+	*reply = args.A * args.B
+	return nil
+}
+
+func (t *Arith) Divide(args *Args, quo *Quotient) error {
+	if args.B == 0 {
+		return errors.New("divide by zero")
+	}
+	quo.Quo = args.A / args.B
+	quo.Rem = args.A % args.B
+	return nil
+}
+```
+
+The server calls:
+```go
+package main
+
+import (
+	"context"
+	"log"
+	"net"
+	
+	"github.com/makasim/jsonrpc"
+
+	"server"
+)
+
+func main() {
+	s := &jsonrpc.Server{
+		Receivers: []interface{}{
+			&server.Arith{},
+		},
+	}
+	
+	if err := s.ListenAndServe(":1234"); err != nil {
+		log.Fatalf("serve: %s", err)
+	}
+}
+
+
+```
+
+
+At this point, clients can see a service "Arith" with methods "Arith.Multiply" and "Arith.Divide". 
+To invoke one, a client does a remote call:
+
+Client:
+```go
+package main
+
+import (
+	"context"
+	"log"
+	
+	"github.com/makasim/jsonrpc"
+	
+	"server"
+)
+
+func main() {
+	ctx := context.Background()
+	args := &server.Args{7,8}
+	var reply int
+	
+	c := &jsonrpc.Client{}
+	
+	err := c.Call(ctx, "127.0.0.1:9999", "FooService.Func", args, &reply)
+	if err != nil {
+		log.Fatal("call error:", err)
+	}
+	
+	log.Println(reply)
+}
+```