Add crates.io and docs.rs badges

Signed-off-by: Sahas Subramanian <[email protected]>

Author: shsms

README.md

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 # Frequenz Microgrid Component Graph
 
+![Crates.io Version](https://img.shields.io/crates/v/frequenz-microgrid-component-graph) ![docs.rs](https://img.shields.io/docsrs/frequenz-microgrid-component-graph)
+
 This is a library for representing the components of a microgrid and the
 connections between them as a Directed Acyclic Graph (DAG).