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+How to write plugins in Coq
+===========================
+  # Working environment : merlin, tuareg (open question)
+  
+  ## OCaml & related tools
+
+  These instructions use [OPAM](http://opam.ocaml.org/doc/Install.html)
+
+```shell
+opam init --root=$PWD/CIW2018 --compiler=4.06.0 -j2
+eval `opam config env --root=$PWD/CIW2018`
+opam install camlp5 ocamlfind num # Coq's dependencies
+opam install lablgtk              # Coqide's dependencies (optional)
+opam install merlin               # prints instructions for vim and emacs
+```
+
+  ## Coq
+
+```shell
+git clone git@github.com:coq/coq.git
+cd coq
+./configure -profile devel
+make -j2
+cd ..
+export PATH=$PWD/coq/bin:$PATH
+```
+
+  ## This tutorial
+
+```shell
+git clone git@github.com:ybertot/plugin_tutorials.git
+cd plugin_tutorials/tuto0
+make .merlin                # run before opening .ml files in your editor
+make                        # build
+```
+  
+  
+  
+  # tuto0 : basics of project organization
+  package a ml4 file in a plugin, organize a `Makefile`, `_CoqProject`
+  - Example of syntax to add a new toplevel command
+  - Example of function call to print a simple message
+  - Example of syntax to add a simple tactic
+      (that does nothing and prints a message)
+  - To use it:
+
+```bash
+    cd tuto0; make
+    coqtop -I src -R theories Tuto0
+```
+
+  In the Coq session type:
+```coq
+    Require Import Tuto0.Loader. HelloWorld.
+```
+
+  # tuto1 : Ocaml to Coq communication
+  Explore the memory of Coq, modify it
+  - Commands that take arguments: strings, symbols, expressions of the calculus of constructions
+  - Commands that interact with type-checking in Coq
+  - A command that adds a new definition or theorem
+  - A command that uses a name and exploits the existing definitions
+    or theorems
+  - A command that exploits an existing ongoing proof
+  - A command that defines a new tactic
+
+  Compilation and loading must be performed as for `tuto0`.
+  
+  # tuto2 : Ocaml to Coq communication
+  A more step by step introduction to writing commands
+  - Explanation of the syntax of entries
+  - Adding a new type to and parsing to the available choices
+  - Handling commands that store information in user-chosen registers and tables
+
+  Compilation and loading must be performed as for `tuto1`.
+
+  # tuto3 : manipulating terms of the calculus of constructions
+  Manipulating terms, inside commands and tactics.
+  - Obtaining existing values from memory
+  - Composing values
+  - Verifying types
+  - Using these terms in commands
+  - Using these terms in tactics
+  - Automatic proofs without tactics using type classes and canonical structures
+
+  compilation and loading must be performed as for `tuto0`.