docs: Added docs.

docs/cli/envr_init.md

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+## envr init
+
+Set up envr
+
+### Synopsis
+
+The init command generates your initial config and saves it to
+~/.envr/config in JSON format.
+
+During setup, you will be prompted to select one or more ssh keys with which to
+encrypt your databse. **Make 100% sure** that you have **a remote copy** of this
+key somewhere, otherwise your data could be lost forever.
+
+```
+envr init
+```
+
+### Options
+
+```
+  -h, --help   help for init
+```
+
+### SEE ALSO
+
+* [envr](envr.md)	 - Manage your .env files.
+