Add .travis.yml and 2 more files to support building on travis ci (#136)

.travis.yml

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+language: swift
+os: osx
+osx_image: xcode11.5
+xcode_workspace: ./wallet/wallet.xcworkspace
+xcode_scheme: wallet
+xcode_destination: platform=iOS Simulator,OS=13.2.2,name=iPhone 8
+addons:
+  homebrew:
+    packages:
+    - rustup-init
+    - sourcery
+env:
+  global:
+  - ZCASH_NETWORK_ENVIRONMENT: TESTNET
+install:
+  - ${TRAVIS_BUILD_DIR}/Scripts/travis/rust_setup.sh
+  - WALLET_DIR=${TRAVIS_BUILD_DIR}/wallet
+  - WALLET_WALLET_DIR=${WALLET_DIR}/wallet
+  - cp ${WALLET_DIR}/env-vars.sh.example ${WALLET_DIR}/env-vars.sh
+  - cd ${WALLET_DIR} ; pod install ; cd ${TRAVIS_BUILD_DIR}
+  - curl https://download.z.cash/downloads/sapling-output.params > ${WALLET_WALLET_DIR}/sapling-output.params
+  - curl https://download.z.cash/downloads/sapling-spend.params > ${WALLET_WALLET_DIR}/sapling-spend.params
+script:
+  - travis_wait 60 xcodebuild -quiet -workspace ${TRAVIS_BUILD_DIR}/wallet/wallet.xcworkspace -scheme wallet -destination platform\=iOS\ Simulator,OS\=13.2.2,name\=iPhone\ 8 build

Scripts/travis/rust_setup.sh

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+#!/bin/bash
+
+set -x
+
+rustup-init --verbose -y
+
+source $HOME/.cargo/env
+
+cargo install cargo-lipo
+rustup target add aarch64-apple-ios x86_64-apple-ios

wallet/env-vars.sh.example

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+export LIGHTWALLETD_ADDRESS="localhost%3a9067"