Add README.md

Author: 01397

README.md

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+# 01397.dev
+
+## Description
+
+This is the source code for my personal website, [01397.dev](https://01397.dev).
+
+## File sources
+
+### HTML files
+
+HTML files are generated from `src/pages/*.tsx` files. React is used as the templating engine. The generated HTML files don't include any React or JavaScript code. The output code is formatted with Prettier.
+
+```mermaid
+graph LR;
+  A[src/pages/*.tsx] -->|React| B[Static HTML]
+  B -->|Prettier| C[Formatted HTML]
+```
+
+### Static files
+
+Copied from `public/*` files to `/dist` directory.
+