Implement group resource (#181)

This change implements a new group resource. 

It also sets the standard for a resource reference will be done through
out the controller. A resource reference can either be done by ID or as
a local named reference to the actual resource. This allows end users to
chose if they want to manage things completely in the cluster or not.

Part of #172

Signed-off-by: Philip Laine <philip.laine@gmail.com>

pkg/applyconfigurations/api/v1alpha1/groupspec.go

@@ -0,0 +1,26 @@
+// Code generated by controller-gen. DO NOT EDIT.
+
+package v1alpha1
+
+// GroupSpecApplyConfiguration represents a declarative configuration of the GroupSpec type for use
+// with apply.
+//
+// GroupSpec defines the desired state of Group
+type GroupSpecApplyConfiguration struct {
+	// name of the group.
+	Name *string `json:"name,omitempty"`
+}
+
+// GroupSpecApplyConfiguration constructs a declarative configuration of the GroupSpec type for use with
+// apply.
+func GroupSpec() *GroupSpecApplyConfiguration {
+	return &GroupSpecApplyConfiguration{}
+}
+
+// WithName sets the Name field in the declarative configuration to the given value
+// and returns the receiver, so that objects can be built by chaining "With" function invocations.
+// If called multiple times, the Name field is set to the value of the last call.
+func (b *GroupSpecApplyConfiguration) WithName(value string) *GroupSpecApplyConfiguration {
+	b.Name = &value
+	return b
+}