chore: license and readme

LICENSE

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+Copyright (c) 2023 thetek
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

README.md

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+# C Template
+
+A template for C programs. Its features include:
+
+- Sane defaults (especially compiler flags)
+- A custom build system written in Python
+- Simple custom testing framework
+- Formatting using `clang-format`
+- Common functions and typedefs included
+- Simple logging library
+
+## Usage
+
+```sh
+# debug build
+build/build.py
+build/build.py debug
+
+# release build
+build/build.py release
+
+# run tests
+build/build.py test
+
+# format source files
+build/build.py fmt
+
+# clean build files
+build/build.py clean
+```
+
+Source files are located in `src/`, header files are located in `inc/` and
+anything used for testing goes in `test/`.