Add Travis build and test configuration.

.swift-version

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+3.0.2

.travis.yml

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+# Travis CI build file for Swift gRPC.
+# (Derived from https://github.com/IBM-Swift/Kitura/blob/master/.travis.yml)
+# Swift gRPC runs on OS X and Linux (Ubuntu).
+# See the following URLs for further details on Travis CI
+# https://docs.travis-ci.com/user/customizing-the-build/
+# https://docs.travis-ci.com/user/docker/
+# https://docs.travis-ci.com/user/multi-os/
+
+# whitelist (branches that should be built)
+branches:
+  only:
+    - master
+    - develop
+    - /^issue.*$/
+
+matrix:
+  include:
+    - os: linux
+      dist: trusty
+      sudo: required
+    - os: osx
+      osx_image: xcode8.2
+      sudo: required
+
+before_install:
+  - git clone https://github.com/IBM-Swift/Package-Builder.git
+
+script:
+  - ./Package-Builder/build-package.sh -projectDir $TRAVIS_BUILD_DIR
+  - make test

README.md

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+[![Build Status](https://travis-ci.org/grpc/grpc-swift.svg?branch=master)](https://travis-ci.org/grpc/grpc-swift)
+
 # Swift gRPC 
 
 This repository contains an experimental Swift gRPC API