Add Compute md5 Digest Of A String as an Elixir til

elixir/compute-md5-digest-of-a-string.md

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+# Compute md5 Digest Of A String
+
+To compute the md5 digest of a string, we can use Erlang's top-level `md5`
+function.
+
+```elixir
+> :erlang.md5("#myelixirstatus")
+<<145, 148, 139, 99, 194, 176, 105, 18, 242, 246, 37, 69, 142, 69, 226, 199>>
+```
+
+This, however, gives us the result in the raw binary representation. We
+would like it in a base 16 encoding, as md5 digests tend to be.
+
+We can wrap (or pipe) this with `Base.encode16` to get the result we are
+looking for.
+
+```elixir
+> Base.encode16(:erlang.md5("#myelixirstatus"), case: :lower)
+"91948b63c2b06912f2f625458e45e2c7"
+```