Added Decode Ways CPP solution

[emmagarr]

Proposed changes

Added Decode Ways C++ solution to Dynamic Programming.

Types of changes

• Proofreading (fix spelling, grammar, punctuation, accuracy) Proofreading
• New content (new section, new readme, etc.)
• Modifications (modifying existing content)
• Other (please describe)

Checklist

• Tested any code that was added/modified in this PR
• Added external links
• Added internal links
• Added images
• Added videos
• Added code snippets

Reviewers:

• @emmagarr

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[shhossain]

Link this to existing readme in dynamimc programming