Create RockandLever.java

[Lokeshsharma1703]

Please place an x inside the [brackets] in the checklist below

Make sure all the item in the checklist have been done before making the PR

• [x ] You have starred the repo
• [ x] If you have added a new folder, there are no spaces in the name of the folder
• [ x] The link to the problem set is present on the first line of the code file
• [ x] Your code (solution) in your code file(s) is accepted by the problemset on CodeForces