Update readme and add travis config

Signed-off-by: Yilun <[email protected]>

.travis.yml

@@ -0,0 +1,4 @@
+language: go
+
+go:
+  - 1.13

README.md

@@ -1,41 +1,42 @@
 # nkn-sdk-go
 
+[![GoDoc](https://godoc.org/github.com/nknorg/nkn-sdk-go?status.svg)](https://godoc.org/github.com/nknorg/nkn-sdk-go) [![GitHub license](https://img.shields.io/badge/license-Apache%202.0-blue.svg)](LICENSE) [![Go Report Card](https://goreportcard.com/badge/github.com/nknorg/nkn-sdk-go)](https://goreportcard.com/report/github.com/nknorg/nkn-sdk-go) [![Build Status](https://travis-ci.org/nknorg/nkn-sdk-go.svg?branch=master)](https://travis-ci.org/nknorg/nkn-sdk-go) [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](#contributing)
+
 Go implementation of NKN client and wallet SDK. The SDK consists of a
 few components:
 
-* [NKN Client](#client): Send and receive data for free between any NKN clients
+- [NKN Client](#client): Send and receive data for free between any NKN clients
   regardless their network condition without setting up a server or relying on
   any third party services. Data are end to end encrypted by default. Typically
   you might want to use [multiclient](#multiclient) instead of using client
   directly.
 
-* [NKN MultiClient](#multiclient): Send and receive data using multiple NKN
+- [NKN MultiClient](#multiclient): Send and receive data using multiple NKN
   clients concurrently to improve reliability and latency. In addition, it
-  supports session mode, a reliable streaming protocol similar to TCP based
-  on [ncp](https://github.com/nknorg/ncp-go).
+  supports session mode, a reliable streaming protocol similar to TCP based on
+  [ncp](https://github.com/nknorg/ncp-go).
 
-* [NKN Wallet](#wallet): Wallet SDK for [NKN
+- [NKN Wallet](#wallet): Wallet SDK for [NKN
   blockchain](https://github.com/nknorg/nkn). It can be used to create wallet,
-  transfer token to NKN wallet address, register name, subscribe to topic,
-  etc.
+  transfer token to NKN wallet address, register name, subscribe to topic, etc.
 
 Advantages of using NKN client/multiclient for data transmission:
 
-* Network agnostic: Neither sender nor receiver needs to have public IP address
+- Network agnostic: Neither sender nor receiver needs to have public IP address
   or port forwarding. NKN clients only establish outbound (websocket)
   connections, so Internet access is all they need. This is ideal for client
   side peer to peer communication.
 
-* Top level security: All data are end to end authenticated and encrypted. No
+- Top level security: All data are end to end authenticated and encrypted. No
   one else in the world except sender and receiver can see or modify the content
   of the data. The same public key is used for both routing and encryption,
   eliminating the possibility of man in the middle attack.
 
-* Decent performance: By aggregating multiple overlay paths concurrently,
+- Decent performance: By aggregating multiple overlay paths concurrently,
   multiclient can get ~100ms end to end latency and 10+mbps end to end session
   throughput between international devices.
 
-* Everything is free, open source and decentralized. (If you are curious, node
+- Everything is free, open source and decentralized. (If you are curious, node
   relay traffic for clients for free to earn mining rewards in NKN blockchain.)
 
 Documentation:
@@ -385,7 +386,8 @@ git commit -s
 
 ## Community
 
-* [Discord](https://discord.gg/c7mTynX)
-* [Telegram](https://t.me/nknorg)
-* [Reddit](https://www.reddit.com/r/nknblockchain/)
-* [Twitter](https://twitter.com/NKN_ORG)
+- [Forum](https://forum.nkn.org/)
+- [Discord](https://discord.gg/c7mTynX)
+- [Telegram](https://t.me/nknorg)
+- [Reddit](https://www.reddit.com/r/nknblockchain/)
+- [Twitter](https://twitter.com/NKN_ORG)