Added developer documentation, testing to Makefile

Makefile

@@ -6,6 +6,7 @@ BINDIR := ${EXEC_PREFIX}/bin
 DATAROOTDIR := ${PREFIX}/share
 MANDIR := ${DATAROOTDIR}/man
 MAN1DIR := ${MANDIR}/man1
+test : GOCMD := go1.11.13
 
 # Use a dateformat rather than -I flag since OSX
 # does not support -I. It also doesn't support 
@@ -47,3 +48,6 @@ clean:
 uninstall: clean
 	rm -f ${DESTDIR}${MAN1DIR}/bombadillo.1.gz
 	rm -f ${DESTDIR}${BINDIR}/${BINARY}
+
+.PHONY: test
+test: clean build

README.md

@@ -125,6 +125,14 @@ We aim for simplicity and quality, and do our best to make Bombadillo useful to
 
 The maintainers use the [tildegit](https://tildegit.org) issues system to discuss new features, track bugs, and communicate with users regarding issues and suggestions. Pull requests should typically have an associated issue, and should target the `develop` branch.
 
+## 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.
+- Bombadillo is tested against Go 1.11. This version can be installed as per the [Go install documentation](https://golang.org/doc/install#extra_versions). Tests for this version are run using 'make test'.
+- Linting is performed by `gofmt` and [golangci-lint](https://github.com/golangci/golangci-lint)
+
 ## License
 
 This project is licensed under the GNU GPL version 3. See the [LICENSE](LICENSE) file for details.