Add a readme

README.md

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+## What's this?
+`getenv` will fetch GCE metadata attributes and print them as K=V pairs ready to be `exported` as environment variables.
+
+Example:
+```bash
+./getenv
+MY_VARIABLE=SOMEVALUE
+```
+
+#### How to use
+
+Export all metadata attributes as ENV variables for current shell session and store them in /etc/environment for future sessions:
+```bash
+export $(./getenv)
+./getenv >> /etc/environment
+```
+or
+```bash
+./getenv >> /etc/environment
+source /etc/environment
+```