Add README.

README.md

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+# TBuild
+
+TBuild is a build system for TempleOS and ZealOS. It features automatic code
+conversion for ZealOS and dependency management.
+
+## Building and installing
+
+To build and install, simply run `./build.sh`. After it has finished compiling,
+you can put the built `tbuild` binary anywhere in your PATH. Make sure you also
+put in the same directory the corresponding RedSeaGen binary for your system.
+
+## Usage
+
+```
+Usage: tbuild [command]
+
+Commands:
+ * init|i [path=.] - Setup a new project.
+ * build|. [--zeal|-z|-Z] - Build project in current working directory.
+ * clean - Clean output code in current working directory.
+
+To see manifest file usage, check out man tbuild(1)
+```
+
+## Manifest file
+
+The manifest file is a file in the TOML format which contains metadata about
+your project. There are two main sections: `General` and `Dependencies`.
+
+### The General section
+
+ - Name: str - The name of the project.
+ - Author: str - The name of the author.
+ - Version: str - The project's version.
+
+### The Dependencies section
+
+This section follows a format for each dependency:
+
+```
+<name> = "<git url>"
+```
+
+So, for example, if you wish to add the ac97 loadable driver into your project,
+you can add an entry like such:
+
+```
+[Dependencies]
+ac97 = "https://git.checksum.fail/slendi/ac97.git"
+```
+
+And if you wish to be in a `AC97` directory instead:
+
+```
+[Dependencies]
+AC97 = "https://git.checksum.fail/slendi/ac97.git"
+```
+
+The dependencies get pulled in and updated at build time.
+
+## Scripts
+
+You can run Python scripts after your files are placed inside the `build`
+directory by creating a `scripts` folder in the root of your project.
+
+It's important to note that scripts DO NOT respect the project's path. As such,
+it is highly recommended to use something like this:
+
+```python
+import os
+dir_path = os.path.dirname(os.path.realpath(__file__)) + '/..'
+```
+
+It is also important to note that you can have as many subdirectories as you
+wish.
+