Add contributing guide

CONTRIBUTING.md

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+## Contributing to Bucket
+
+Bucket specialized framework for one-bucket usage of Couchbase. Our aim to provide simple usage of Couchbase over best practices like:
+
+- Handle bucket as SQL's database
+- No embedded fields over the JSON, only simple ones per document (this makes indexing lot more efficient)
+- Full-text search capabilities
+- Automatic document indexing based on tagged structs
+
+#### Contributing
+
+We are following the `git flow` principles.
+
+- New changes comes as feature branches. Branch name looks like ex.: `feature/T52-short-name` where the T{num} represents the issue number
+- We ONLY accepts pull requests into our develop branch.
+- The most up-to-date branch is the develop, so new features should created from it.
+- Releases happens frequently from develop to master with semantic versions.
+
+#### Development environment.
+
+Since it's a framework for Couchbase it's required to run a Couchbase. We can provide the necessary infrastructure by the following command. (NOTE: after the start it will setup a cluster and a bucket, so before running the tests it's necessary to wait a bit)
+
+- `make dev`
+
+

Makefile

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 testing:
-	PKG_TEST=testing go test ./...
+	PKG_TEST=testing go test ./...
+
+dev:
+	docker-compose -f test/docker-compose.yml down
+	docker-compose -f test/docker-compose.yml up -d