upload readme and how-to-build

Signed-off-by: Double Sine <xiao_ai_yu@live.cn>

doc/how-to-build.md

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+# navicat-keygen for linux - How to build?
+
+[中文版](how-to-build.zh-CN.md)
+
+## 1. Prerequisites
+
+1. Install latest `CMake`:
+
+   ```bash
+   $ sudo apt-get install cmake
+   ```
+
+2. Install `fmt`, `OpenSSL` and `rapidjson`:
+
+   ```bash
+   $ sudo apt-get install libfmt-dev libssl-dev rapidjson-dev
+   ```
+
+## 2. Build
+
+1. Clone:
+
+   ```bash
+   $ git clone -b linux --single-branch https://notabug.org/doublesine/navicat-keygen.git
+   $ cd navicat-keygen
+   ```
+
+2. Build:
+
+   ```bash
+   $ mkdir build
+   $ cd build
+   $ cmake -DCMAKE_BUILD_TYPE=Release ..
+   $ cmake --build . -- -j4
+   ```
+
+   Then you will see two executable files, `navicat-keygen` and `navicat-patcher`, in `build` directory.

doc/how-to-build.zh-CN.md

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+# navicat-keygen for linux - 如何编译？
+
+## 1. 前提条件
+
+1. 安装最新的 `CMake`:
+
+   ```bash
+   $ sudo apt-get install cmake
+   ```
+
+2. 安装 `fmt`、`OpenSSL` 和 `rapidjson`:
+
+   ```bash
+   $ sudo apt-get install libfmt-dev libssl-dev rapidjson-dev
+   ```
+
+## 2. 编译
+
+1. clone仓库:
+
+   ```bash
+   $ git clone -b linux --single-branch https://notabug.org/doublesine/navicat-keygen.git
+   $ cd navicat-keygen
+   ```
+
+2. 编译:
+
+   ```bash
+   $ mkdir build
+   $ cd build
+   $ cmake -DCMAKE_BUILD_TYPE=Release ..
+   $ cmake --build . -- -j4
+   ```
+
+   编译完后你会在build文件夹里看到两个可执行文件 `navicat-keygen` 和 `navicat-patcher`。