add README; add deps

README.md

+# A web application to process XRF images
+
+XRF-App is a web application for the analysis of XRF images of cultural heritage works.
+
+XRF stands for X-Ray Fluorescence and is a technique that uses X rays to peek at the chemical components used in the manifucturing of the work being scanned.
+
+This application allows to load an image from a remote digital library and to process it directly in the web browser.
+
+## For developers
+
+The application is written in typescript.
+
+The dependencies are specified in `package.json` and can simply be installed running `npm install` from the project root directory. The dependencies are installed locally in the `node_modules` subdirectory.

package.json

@@ -2,7 +2,7 @@
   "name": "chnet-xrf",
   "version": "0.1.0",
   "dependencies": {
-    "@types/jquery": "^3.2.16"
+    "jquery": "^3.2.1"
   },
   "description": "Web application to analyse XRF images",
   "license": "EUPL",