add readme

README.md

@@ -0,0 +1,24 @@
+# usage
+
+works with node2nix. very simple
+
+## reconfigure node packages
+updates nix files depending on package.json
+``` shell
+node2nix
+```
+
+## build
+``` shell
+nix-build -A package
+```
+
+## run
+``` shell
+#run the executable
+./result/bin/EvidenceDump
+
+#run jusing node
+node result/lib/node_modules/EvidenceDump/server.js
+```
+