Updated readme.MD.

README.md

 # irstea-typescript-config
 
-TSC and TSLint configuration.
+TSC and TSLint configuration.
\ No newline at end of file
+
+# Installation
+
+```bash
+npm add -D irstea-typescript-config
+```
+
+Also install the peer dependencies.
+
+# Usage
+
+In `tsconfig.json`:
+
+```json
+{
+  "extends": "node_modules/irstea-typescript-config/tsconfig.json",
+  ...
+}
+```
+
+In `tsling.json`:
+
+```json
+{
+  "extends": [
+    "tslint:recommended",
+    "irstea-typescript-config"
+  ],
+  ...
+}
+```