add logo and header

Author: ImreSamu

README.md

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 # Awesome Postgres [![awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38d29fed78fa85652e3a63e154dd8e8829/media/badge.svg)](https://github.com/sindresorhus/awesome)
-A curated list of awesome PostgreSQL software, libraries, tools and resources, inspired by awesome-mysql
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+[<img src="https://wiki.postgresql.org/images/a/a4/PostgreSQL_logo.3colors.svg" align="right"  width="100">](https://www.postgresql.org/)
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+> A curated list of awesome [PostgreSQL](https://www.postgresql.org/) software, libraries, tools and resources, inspired by [awesome-mysql](http://shlomi-noach.github.io/awesome-mysql/)
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+[PostgreSQL](https://en.wikipedia.org/wiki/PostgreSQL), often simply Postgres, is an [object-relational database](https://en.wikipedia.org/wiki/Object-relational_database) (ORDBMS). PostgreSQL is [ACID-compliant](https://en.wikipedia.org/wiki/ACID) and [transactional](https://en.wikipedia.org/wiki/Transaction_processing). (see more: [wikipedia:PostgreSQL](https://en.wikipedia.org/wiki/PostgreSQL), [PostgreSQL.org](https://postgresql.org))
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+ :elephant: Contributions welcome. Add links through [pull requests](https://github.com/dhamaniasad/awesome-postgres/pulls) or create an [issue](https://github.com/dhamaniasad/awesome-postgres/issues) to start a discussion. Please take a look at the [contribution guidelines](CONTRIBUTING.md).
 
 ## Contents