Add Dockerfile for 06-challenge-binsh-shellcode

[cristina-marina1407]

Added the following files:
1) A multi-stage Dockerfile: build stage and runtime stage.
2) A script to automatically run the Dockerfile.
3) A README.md file to explain the whole building and running process.

Prerequisite Checklist

• Read the contribution guidelines regarding submitting new changes to the project;
• Tested your changes against relevant architectures and platforms;
• Updated relevant documentation (if needed).

Description of changes

[razvand]

Add ending newlines.

[razvand]

Use present tense in commit message.

Use proper name Cristina Postelnicu <cristinapostelnicu3107@gmail.com>

[razvand]

Rewrite your commit history to do two commits:

• One commit adds Makefile.sol as the Makefile to build the vulnerable app.
• One commit adds Dockerfile, Makefile and README.md - introducing the support for Docker.

To do this, you would do:

git config --global user.name "Cristina Postelnicu"  # set commit author name globally
git config --global user.email "cristinapostelnicu3107@gmail.com" # set commit email globally
git reset HEAD^2       # revert the two current commits
git add Makefile.sol 
git commit -s     # commit and sign Makefile.sol
git add Makefile README.md Dockerfile
git commit -s     # commit and sign Makefile README.md Dockerfile
git push --force origin 06-challenge-binsh-shellcode

Take a good look at the above commands, make sure you understand them. Ask for further clarification if required.

Also, be sure to use proper commit messages. Start commit message lines with 06-binsh-chall: prefix. Add a commit description detailing the motivation / rationale of the commit. Take a look at these instructions and the commit history.

[razvand]

You have an extra Tab here, right?

[razvand]

Remove extra two ending newlines.

[razvand]

Copy Makefile.sol and then run make.

[razvand]

Use a blank line after FROM line.

[razvand]

Use a blank line after FROM line.

[razvand]

Use a blank line after EXPOSE line.