Add Git ignore

.gitignore

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+# Generated header file
+zcashlc.h
+
+# Rust
+
+## Generated by Cargo
+## will have compiled files and executables
+/target/
+
+## These are backup files generated by rustfmt
+**/*.rs.bk
+
+# params files
+*.params
+# Xcode
+
+## Build generated
+build/
+DerivedData/
+
+## Various settings
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata/
+
+## Other
+*.moved-aside
+*.xccheckout
+*.xcscmblueprint
+
+## Obj-C/Swift specific
+*.hmap
+*.ipa
+*.dSYM.zip
+*.dSYM
+
+## Playgrounds
+timeline.xctimeline
+playground.xcworkspace
+
+# Swift Package Manager
+.build/
+
+# Carthage
+Carthage/Checkouts
+Carthage/Build
+Example/**/Carthage
+# Accio dependency management
+Dependencies/
+.accio/
+
+# fastlane
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots/**/*.png
+fastlane/test_output
+
+# Code Injection
+iOSInjectionProject/
+
+# macOS
+
+## General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+#ignore Pods directory for example project 
+Pods
+
+# do not commit generated libraries to this repo
+lib
+*.a
+*.generated.swift
+env-vars.sh
+wallet/wallet/Generated/Constants.generated.swift