Add .gitignore file

Signed-off-by: beorn7 <beorn@grafana.com>

documentation/prometheus-mixin/.gitignore

@@ -0,0 +1,4 @@
+*.yaml
+dashboards_out
+vendor
+jsonnetfile.lock.json

documentation/prometheus-mixin/README.md

@@ -1,6 +1,13 @@
 # Prometheus Mixin
 
-The Prometheus Mixin is a set of configurable, reusable and extensible alerts
+The Prometheus Mixin is a set of configurable, reusable, and extensible alerts
 and dashboards for Prometheus.
 
 For instructions on how to use mixins, see https://github.com/monitoring-mixins/docs.
+
+
+TODO: need jsonnet v0.10+
+TODO: add MAkefile, explain things.
+
+go get github.com/google/go-jsonnet/cmd/jsonnet
+go get github.com/jsonnet-bundler/jsonnet-bundler/cmd/jb