Merge pull request exercism#56 from rcode5/improve-developers-readme

update readme based on real life experience

Author: kytrinyx

README.md

@@ -19,9 +19,13 @@ If that throws an error, try ```brew install go --cross-compile-common --with-ll
 
 Development
 ===========
-1. Fork and clone into your `$GOPATH/src`
-1. `go get`
-1. `go install github.com/levicook/glitch`
+1. `cd $GOPATH`
+1. git clone git@github.com:exercism/cli.git src/github.com/exercism/cli
+1. cd src/github.com/exercism/cli
+1. go get
+1. go get github.com/levicook/glitch
+1. go install github.com/levicook/glitch
+1. Make sure $GOPATH/bin is on your path (you may need something like `export PATH=$PATH:/projects/goprojects/bin`)
 1. Open a separate terminal window to your project directory and run the command `glitch`
 1. Write a test.
 1. Watch test fail.
@@ -48,3 +52,52 @@ To fix it update the `codegangsta/cli` dependency:
 $ go get -u github.com/codegangsta/cli
 ```
 
+New to go?  Missing packages for glitch?
+-------------------------------------------
+
+### missing assertion library
+
+When you `glitch`, do you get stymied like this?
+
+```shell
+# github.com/exercism/cli
+api_test.go:7:2: cannot find package "github.com/stretchr/testify/assert" in any of: ...
+FAIL	github.com/exercism/cli [setup failed]
+```
+
+You may need to
+
+
+```shell
+$ go get github.com/stretchr/testify/assert
+$ go install github.com/stretchr/testify/assert
+$ glitch
+```
+
+### `go vet` on MacOS
+
+Depending on your brew installation of `go` you may not yet have the `vet` command available.  You may also need `hg` (mercurial) to get rolling.
+
+Here's a sample (trimmed) output from a successful installation of `vet` on MacOSX 10.8.5 with XCode 5.0.2
+
+```shell
+% brew install go --cross-compile-common
+
+... installation output ...
+
+% go vet
+go tool: no such tool "vet"; to install:
+	go get code.google.com/p/go.tools/cmd/vet
+
+% go get code.google.com/p/go.tools/cmd/vet
+go: missing Mercurial command. See http://golang.org/s/gogetcmd
+
+% brew install hg
+% go get code.google.com/p/go.tools/cmd/vet
+% go vet
+
+```
+
+Now you should be able to run `glitch`.
+
+