doc: complete README

.gitignore

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+node_modules/
+.vscode/

README.md

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+
+# Converter
+
+Tools allowing to convert arabic number into roman number
+
+## Demo
+
+converter.voiedesombres.com
+
+## Tech Stack
+
+**SPA:** VueJs v3, TailwindCSS
+
+**API:** NestJS
+
+## Installation
+
+```bash
+    git clone https://git.voiedesombres.com/Shalma/converter.git
+```
+
+Have docker installed
+
+```bash
+  cd converter/spa
+  npm install
+  npm run dev
+```
+
+```bash
+  cd converter/api
+  npm install
+  npm run start
+```
+
+Load spa with localhost:8080