Added a brief readme to please github

GijsVermarien · GijsVermarien · commit c942def982d5 · 2021-11-17T16:41:22.000+01:00
diff --git a/README.md b/README.md
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+# Hermite Post-Newtonian
+
+This code expands the original hermite code with post-newtonian terms.

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	`1`	`+# Hermite Post-Newtonian`
	`2`	`+`
	`3`	`+This code expands the original hermite code with post-newtonian terms.`