Add rough draft of makefile to experiment with

src/build-deps.sh

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+#!/bin/sh
+vendors/opam-repository-tools/rewrite-local-opam-repository.sh
+opam repository add localrepo "file://$PWD/vendors/ligo-opam-repository-local-generated/"
+opam install ocp-indent merlin alcotest-lwt crowbar
+opam user-setup install
+opam install -y --build-test --deps-only ./src/ 

src/build.sh

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+#! /bin/sh
+
+dune build -p ligo

src/install.sh

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+add-apt-repository ppa:avsm/ppa
+apt update
+apt-get install opam mercurial darcs make m4 gcc libev-dev libgmp-dev pkg-config libhidapi-dev
+opam init --bare
+y
+y

src/makefile

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+install:
+	./install.sh
+
+build-deps:
+	./build-deps.sh
+
+build: build-deps
+	./build.sh
+
+test: build
+	dune build @ligo-test