Create CONTRIBUTIONS.md

CONTRIBUTIONS.md

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+<b> Without these people, repos and posts I couldn't make a better Printer.</b>
+
+> In order of help received.
+
+1. StackOverflow's posts.
+2. [Robert M Ryan](https://github.com/robertmryan) for providing tips on improving the Printer class.
+3. [thellimist](https://github.com/thellimist/EZPods) for a step by step guide to add the Printer on CocoaPods.
+4. [Kiran Jasvanee](https://github.com/KiranJasvanee) for providing idea about the access specifiers.
+5. [These lovely people who encouraged me to keep developing on the Printer](https://github.com/hemangshah/printer/stargazers).
+6. [... and these great people who raised issues and provided me enough informations to fixed it.](https://github.com/hemangshah/printer/issues?q=is%3Aissue+is%3Aclosed)
+
+**Thank you so much.** <3