Update README.md

Merge branch 'master' of github.com:NimSum/git-commander

Set local image copy of obstacle

Style delete saved challenge buttons

Add delete challenge(spcific card) functionality

Add clear stored challenges history btn

Adjust explosion animation duration

Disable command input when the prompts with buttons are present, closes #53

Obstacles do not re generate after game reset, closes #52

Update instruction box bg, add hover state to start game btn, closes #49

Avoid repeating questions for current session

Split challenge generator into two for duplicate questions avoidance

Limit name length to 25 for UI purposes, closes #54

Update README.md

Update README.md