Add README.md

Signed-off-by: George Kaklamanos <gkaklas@gkaklas.gr>

README.md

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+# curl-sh
+
+You shouldn't trust and run random snippets from the Internet! (at least without looking at their code first)
+
+These snippets save a static binary of the utility in your current directory.
+
+To get [`dua`](https://gkak.la/dua):
+```sh
+curl -sL gkak.la/getdua | sh
+```
+To get [`nnn`](https://gkak.la/nnn):
+```sh
+curl -sL gkak.la/getnnn | sh
+```