Add makefile, license, and move main.go to preferred location

Author: WTFox

.gitignore

@@ -1,2 +1,9 @@
+# macOS stuff
 .DS_Store
+
+# Binaries
 bin/
+
+# Test files
+array.json
+map.json

CHANGELOG.md

@@ -0,0 +1,27 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.1] - 2020-06-20
+
+### Added
+
+- Added this change log!
+- Added Makefile to build for all systems
+- Added docstrings to all exported types and functions
+- Added License
+
+### Changed
+
+- jf now prints out help when invalid arguments are supplied
+- jf is now able to consume JSON files of various structures
+- Various project structure changes to be more consistent with standard Go packages
+
+## [1.0.0] - 2020-06-18
+
+### Added
+
+- Initial release of jf

Makefile

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+EXECUTABLE=jf
+WINDOWS=$(EXECUTABLE)_windows_amd64.exe
+LINUX=$(EXECUTABLE)_linux_amd64
+DARWIN=$(EXECUTABLE)_darwin_amd64
+VERSION=$(shell git describe --tags --always --long --dirty)
+
+.PHONY: all test clean
+
+all: test build ## Build and run tests
+
+test: ## Run unit tests
+	./scripts/test_unit.sh
+
+build: windows linux darwin ## Build binaries
+	@echo version: $(VERSION)
+
+windows: $(WINDOWS) ## Build for Windows
+
+linux: $(LINUX) ## Build for Linux
+
+darwin: $(DARWIN) ## Build for Darwin (macOS)
+
+$(WINDOWS):
+	env GOOS=windows GOARCH=amd64 go build -i -v -o $(WINDOWS) -ldflags="-s -w -X main.version=$(VERSION)"  ./cmd/jf/main.go
+
+$(LINUX):
+	env GOOS=linux GOARCH=amd64 go build -i -v -o $(LINUX) -ldflags="-s -w -X main.version=$(VERSION)"  ./cmd/jf/main.go
+
+$(DARWIN):
+	env GOOS=darwin GOARCH=amd64 go build -i -v -o $(DARWIN) -ldflags="-s -w -X main.version=$(VERSION)"  ./cmd/jf/main.go
+
+clean: ## Remove previous build
+	rm -f $(WINDOWS) $(LINUX) $(DARWIN)
+
+help: ## Display available commands
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'