Added DEVELOPING.md to include versioning process steps

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# Developing Bombadillo
## Getting Started
Following the standard install instructions should lead you to have nearly everything you need to commence development. The only additions to this are:
- To be able to submit pull requests, you will need to fork this repository first.
- The build process must be tested with Go 1.11 to ensure backward compatibility. This version can be installed as per the [Go install documentation](https://golang.org/doc/install#extra_versions). Check that changes build with this version using `make test`.
- Linting must be performed on new changes using `gofmt` and [golangci-lint](https://github.com/golangci/golangci-lint)
## How changes are made
A stable version of Bombadillo is kept in the default branch, so that people can easily clone the repo and get a good version of the software.
New changes are introduced to the **develop** branch.
Changes to the default branch occur as part of the software release process. This usually occurs when:
- there are a set of changes in **develop** that are good enough to be considered stable.
- an urgent issue is identified in the stable version that requires immediate changes
### Process for introducing a new change
Please refer to our [notes on contributing](README.md#contributing) to get an understanding of how new changes are initiated, the type of changes accepted and the review process.
1. Create a new feature branch based on the **develop** branch.
1. Raise a pull request (PR) targeting the **develop** branch.
1. The PR is reviewed.
1. If the PR is approved, it is merged.
1. The version patch number is incremented.
### Incrementing the version number
Version numbers are comprised of three digits: major version number, minor version number, and patch number.
Each new change added to **develop** should increment the patch number. For example, version 2.0.1 would become 2.0.2. After the change is merged from the feature branch to **develop**:
```shell
# ensure everything is up to date and in the right place
git checkout develop
git pull
# get the commit ID for the recent merge
git log
# get the current version number
git tag
# add the incremented version number to the commit-id, for example:
git tag 2.0.2 abcdef
```
As part of the software release process, any part of the version number may change:
- Urgent changes increment the **patch** number
- A set of small changes increments the **minor** version number
- A significant change to large parts of the application increments the **major** version number
The process is very similar to the above commands, however the final command should include an annotation:
```shell
git tag 2.1.0 abdef -a "This version adds several new features..."
```
Release information should also be added to the [tildegit releases page](https://tildegit.org/sloum/bombadillo/releases).

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## Development
Following the standard install instructions should lead you to have nearly everything you need to commence development. The only additions to this are:
- To be able to submit pull requests, you will need to fork this repository first.
- The build process must be tested with Go 1.11 to ensure backward compatibility. This version can be installed as per the [Go install documentation](https://golang.org/doc/install#extra_versions). Check that changes build with this version using `make test`.
- Linting must be performed on new changes using `gofmt` and [golangci-lint](https://github.com/golangci/golangci-lint)
See [DEVELOPING.md](DEVELOPING.md) for information on how changes to Bombadillo are made, along with other technical information for developers.
## License