Add roadmap (#10536)

doc/direction.md

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+# Minetest Direction Document
+
+## 1. Long-term Roadmap
+
+The long-term roadmaps, aims, and guiding philosophies are set out using the
+following documents:
+
+* [What is Minetest?](http://c55.me/blog/?p=1491)
+* [celeron55's roadmap](https://forum.minetest.net/viewtopic.php?t=9177)
+* [celeron55's comment in "A clear mission statement for Minetest is missing"](https://github.com/minetest/minetest/issues/3476#issuecomment-167399287)
+* [Core developer to-do/wish lists](https://forum.minetest.net/viewforum.php?f=7)
+
+## 2. Medium-term Roadmap
+
+These are the current medium-term goals for Minetest development, in no
+particular order.
+
+These goals were created from the top points in a
+[roadmap brainstorm](https://github.com/minetest/minetest/issues/10461).
+This should be reviewed approximately yearly, or when goals are achieved.
+
+Pull requests that address one of these goals will be labelled as "Roadmap".
+PRs that are not on the roadmap will be closed unless they receive a concept
+approval within a week, issues can be used for preapproval.
+Bug fixes are exempt for this, and are always accepted and prioritised.
+See [CONTRIBUTING.md](../.github/CONTRIBUTING.md) for more info.
+
+### 2.1 Rendering/Graphics improvements
+
+The priority is fixing the issues, performance, and general correctness.
+Once that is done, fancier features can be worked on, such as water shaders,
+shadows, and improved lighting.
+
+Examples include
+[transparency sorting](https://github.com/minetest/minetest/issues/95),
+[particle performance](https://github.com/minetest/minetest/issues/1414),
+[general view distance](https://github.com/minetest/minetest/issues/7222).
+
+This includes work on maintaining
+[our Irrlicht fork](https://github.com/minetest/irrlicht), and switching to
+alternative libraries to replace Irrlicht functionality as needed
+
+### 2.2 Internal code refactoring
+
+To ensure sustainable development, Minetest's code needs to be
+[refactored and improved](https://github.com/minetest/minetest/pulls?q=is%3Aopen+sort%3Aupdated-desc+label%3A%22Code+quality%22+).
+This will remove code rot and allow for more efficient development.
+
+### 2.3 UI Improvements
+
+A [formspec replacement](https://github.com/minetest/minetest/issues/6527) is
+needed to make GUIs better and easier to create. This replacement could also
+be a replacement for HUDs, allowing for a unified API.
+
+A [new mainmenu](https://github.com/minetest/minetest/issues/6733) is needed to
+improve user experience. First impressions matter, and the current main menu
+doesn't do a very good job at selling Minetest or explaining what it is.
+A new main menu should promote games to users, allowing Minetest Game to no
+longer be bundled by default.
+
+The UI code is undergoing rapid changes, so it is especially important to make
+an issue for any large changes before spending lots of time.
+
+### 2.4 Object and entity improvements
+
+There are still a significant number of issues with objects.
+Collisions,
+[performance](https://github.com/minetest/minetest/issues/6453),
+API convenience, and discrepancies between players and entities.