Prepared for first release

- Creating db file in home dir or DB_FILE env variable
- Updated README with usages details
- Added GIF screencast

build.sh

@@ -0,0 +1,5 @@
+env GOOS=darwin GOARCH=amd64 go build -ldflags="-s -w" -o builds/geek-life_darwin-amd64 ./app
+env GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -o builds/geek-life_linux-amd64 ./app
+env GOOS=linux GOARCH=arm64 go build -ldflags="-s -w" -o builds/geek-life_linux-arm64 ./app
+env GOOS=windows GOARCH=386 go build -ldflags="-s -w" -o builds/geek-life_windows-386.exe ./app
+upx builds/geek-life_*