Initial commit
Add empty android project
Fix typo lesson1 -> lesson4
Add robolectric routine
Add CalculationEngine and Dummy Implementation
Add an empty README.md
Add homework
Budkov Sergey 2536

all tasks lesson 4
SergeyBudkov 2536
Merge remote-tracking branch 'origin/master'

Conflicts:
	.gitignore
	README.md
	app/build.gradle
	app/proguard-rules.pro
	app/src/main/AndroidManifest.xml
	app/src/main/res/values/strings.xml
	app/src/main/res/values/styles.xml
	build.gradle
	gradle.properties
	gradle/wrapper/gradle-wrapper.properties