Fix: Generate ObjectMeta instead of Object in Delete functions

The Delete operation only requires the ObjectMeta details so there is
no use in generating the entire object. This changes the Delete
functions of all objects (service, configmap, secret) to directly
generate ObjectMeta and assign it to Empty Object. This is not a
breaking change.

Resolves #17

Add Service Package

Added Support for custom Generate function

Improve Documentation

Added Usage section describing the simple usage for creating a
Configmap. Also added the list of supported objects and check-list.

fix(configmap): changed the names of variables to reflect new terminology

Secret Package