Preliminary update docs and license

LICENSE

@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+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 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.
+
+For more information, please refer to <https://unlicense.org>

README.md

@@ -1,7 +1,12 @@
 # WCH_V307_RISC-V
 Bare metal programming on WCH RISC-V MCU CH32V307VCT6 board (CH32V307V-EVT-R1)
 
-[![Build Status](https://github.com/Embedded-System-Lovers/WCH_V307_RISC-V/actions/workflows/WCH_V307_RISC-V.yml/badge.svg)](https://github.com/Embedded-System-Lovers/WCH_V307_RISC-V/actions)
+<p align="center">
+    <a href="https://github.com/Embedded-System-Lovers/WCH_V307_RISC-V/actions">
+        <img src="https://github.com/Embedded-System-Lovers/WCH_V307_RISC-V/actions/workflows/WCH_V307_RISC-V.yml/badge.svg" alt="Build Status"></a>
+    <a href="https://github.com/Embedded-System-Lovers/WCH_V307_RISC-V/blob/master/LICENSE">
+        <img src="https://img.shields.io/badge/license-Unlicense-blue.svg" alt="Unlicense"></a>
+</p>
 
 This repository implements an entirely manually-written, pure
 _bare_ _metal_ Blinky Project for the SiFive
@@ -13,11 +18,13 @@ Features include:
   - blinky LED show with adjustable frequency,
   - implementation in C99 with absolute minimal use of assembly.
 
-A clear and easy-to-understand build system based on GNUmake
-completes this fun and educational project.
+Clear and easy-to-understand build systems based on either
+GNUmake or CMake complete this fun and educational project.
 
 This repository provides keen insight on starting up
-a _bare_ _metal_ SiFive RISC-V controller.
+a _bare_ _metal_ SiFive RISC-V controller. It emphasizes
+simplicity and independence from monolithic toolchains
+through its lightweight, self-written implementation.
 
 ## Details on the Application
 
@@ -34,28 +41,43 @@ interrupt handler.
 
 ## Building the Application
 
-Build on `*nix*` is easy using an installed `gcc-riscv-none-embed`
+Build on `*nix*` is easy using `gcc-riscv32-unknown-elf`
 
-Make can be used to build the Application:
+Both Make and Cmake can be used to build the Application:
 
 ```sh
 cd WCH_V307_RISC-V
 cd Build
 ```
 ### Make
+
+```sh
+./Rebuild.sh
 ```
-bash Rebuild.sh
+
+### CMake
+
+```sh
+mkdir Output && cd Output
+cmake -DCMAKE_TOOLCHAIN_FILE=../cmake/toolchain-unix.cmake .. && make
 ```
+
 The build results including ELF-file, HEX-mask, MAP-file
 and assembly list file are created in the `Output` directory.
 
-If `gcc-riscv-none-embed` is not installed, it can easily
-be obtained [here](https://github.com/xpack-dev-tools/riscv-none-embed-gcc-xpack/releases).
+If `gcc-riscv32-unknown-elf` is not installed, it can easily
+be obtained from [embecosm](https://www.embecosm.com/resources/tool-chain-downloads/#riscv-stable).
 Add the path of the RISC-V GCC tools' bin folder to `$PATH`
 in the usual `*nix` way.
 
 ## Continuous Integration
 
 CI runs on pushes and pull-requests with simple
-at the moment a single build including result verification
-runs on `ubuntu-latest` using GitHub Actions.
+build(s) including result verification on `ubuntu-latest`
+and `macos-latest` using GitHub Actions.
+
+## Licensing
+
+  - The source and build code written for this repo is licensed under [_The_ _Unlicense_](./LICENSE).
+  - Also the system-register file [`riscv-csr.h`](https://github.com/Embedded-System-Lovers/RED-V_SiFive_RISC-V_FE310_SoC/blob/master/Code/Mcal/riscv-csr.h), originally from [five-embedded](https://five-embeddev.com), is licenced under [_The_ _Unlicense_](./LICENSE).
+