mix: add page

pages/common/mix.md

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+# mix
+
+> Mix is a build tool that provides tasks for creating, compiling, and testing Elixir projects, managing its dependencies, and more.
+
+- List all mix commands:
+
+`mix help`
+
+- Execute particular file:
+
+`mix run {{my_script.exs}}`
+
+- Create a new project:
+
+`mix new {{project_name}}`
+
+- Compile project:
+
+`mix compile`
+
+- Start an iex session inside the project:
+
+`iex -S mix`
+
+- Run project tests:
+
+ `mix test`