madb: add README.md file in the project root

Initial version of README.md file for madb project.
The content should be improved over time.

Change-Id: Iaabd56ae708ac351c13e07cdbb1eca5c6d91934e
ref: #17
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+# Madb: Multi-device Android Debug Bridge
+
+[![GoDoc](https://godoc.org/github.com/vanadium/madb?status.svg)](https://godoc.org/github.com/vanadium/madb)
+
+Madb is a command line tool that wraps Android Debug Bridge (adb) and provides
+various features for controlling multiple Android devices concurrently.
+
+This tool is part of the Vanadium effort to build a framework and a set of
+development tools to enable and ease the creation of multi-device user
+interfaces and apps.
+
+# Requirements
+
+* OS
+ - Linux (64bit)
+ - Mac OS X (64bit)
+ - Windows will be supported soon
+* Tools
+ - [ADB](http://developer.android.com/tools/help/adb.html): must be
+installed and accessible from `PATH`. ADB comes with the Android SDK.
+ - (Optional) [Flutter](https://flutter.io/): needed for using Flutter project
+   specific features.
+
+# Installing madb
+
+## Using Go Get Command
+
+If you have Go command line tool installed, you can use the `go get`
+command to get the most recent version of `madb`:
+
+    go get github.com/vanadium/madb
+
+This will install the tool under `<your first GOPATH>/bin/madb`. Make sure to
+add `<your first GOPATH>/bin` to your `PATH` environment variable before using
+`madb`. To upgrade the tool to the most recent version:
+
+    go get -u github.com/vanadium/madb
+
+## Other Ways to Install
+
+We plan to release pre-compiled binaries for different platforms on the
+[releases page](https://github.com/vanadium/madb/releases), and via Homebrew in
+the near future.
+
+# Getting Started
+
+This section introduces the most notable features of `madb`. To see the complete
+list of features and their options, please use `madb help` or
+`madb help <sub command>`.
+
+## Running an Android App on Multiple Devices
+
+## Running an ADB Command on Multiple Devices
+
+## Giving Nicknames to Devices
+
+## Specifying Devices
+
+## Getting Logcat Output from Multiple Devices