Add a README.md.

README.md

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+mccl
+====
+
+Which stands for Minecraft Console Launcher.
+
+As a fellow pirate I got tired of that there are no vanilla builds on torrents.
+After a very short research I found I can just download everything directly
+from Mojang without authorization. xD
+
+So I wrote this launcher... :)
+
+It can install only vanilla game, mod launchers should be installed using theirs
+installers. But, after some testing and fixes (fixes for Forge), it can run
+Forge, Fabric, and Quilt. I know there are other mod launchers as well, but
+I didn't test them.
+
+There's still a lot of work left.
+
+Since I don't have a Mac or Hackintosh I cannot handle MacOS properly. Rules
+should probably work though.
+
+Using
+-----
+
+```bash
+    mccl install|i version directory
+    mccl run|r version directory [-u User] [-U UUID] [--java-Xmx 4G] [--profile]
+    mccl list|l directory
+```
+
+`version` is game version like `1.20.2` or `23w43b`. Or it can be
+`[latest-]release` or `[latest-]snapshot` to install respectively a freshest
+release or snapshot version.
+
+`directory` is a root path where all game files will be installed to, or runned
+from, or listed.
+
+`-u,--username` is a player's in-game username.
+
+`-U,--uuid` is a UUID of your account. Even though this launcher doesn't perform
+an authorization, passing your username and account's UUID will still load your
+skin.
+
+`--profile` tells to load a `mccl_profile.json` if it exists or store passed
+(or theirs defaults otherwise) `--username` `--uuid` and `--java-Xmx`. Once
+stored, you can omit `-u`, `-U`, and `--java-Xmx`, and just pass `--profile`,
+and it will load your username, UUID and a maximum heap size.
+
+TODO
+----
+
+- Rewrite LocateJavaHome for Linux so that it will actually search for an
+existing Java installation.
+- Implement `uninstall|u` command. It is not easy, since I must look through all
+installed versions what assets and libraries are used. Btw, I think it will be 
+good if in case of removing of a vanilla version all mod loaders for that
+version should be removed as well. Make that a default behaviour and introduce
+a flag that disable it.