feat: added elixir solution

challenges/intermediate/crack-caesar-cipher/solutions/micheleriva/.formatter.exs

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+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

challenges/intermediate/crack-caesar-cipher/solutions/micheleriva/.gitignore

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+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+caesar_cipher-*.tar
+
+
+# Temporary files for e.g. tests
+/tmp

challenges/intermediate/crack-caesar-cipher/solutions/micheleriva/README.md

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+# CaesarCipher
+
+**TODO: Add description**
+
+## Installation
+
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed
+by adding `caesar_cipher` to your list of dependencies in `mix.exs`:
+
+```elixir
+def deps do
+  [
+    {:caesar_cipher, "~> 0.1.0"}
+  ]
+end
+```
+
+Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
+and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
+be found at [https://hexdocs.pm/caesar_cipher](https://hexdocs.pm/caesar_cipher).
+