added README

assets/README.md

+# Projekt CiS-Projekt 2021/22
+
+Citation network made with **d3.js**
+
+## Usage
+### Input 
+Json file **json\_text.json** in directory
+```json
+{
+    "nodes": [
+        {
+            "name": <title: string>,
+            "author": [<author1: string>, <author2: string>, ...],
+            "year": <date: tring>,
+            "journal": <journal: string>,
+            "doi": <doi: string>,
+            "group": <"input"/"height"/"depth">,
+            "citations": <citation: int>
+        }, ...
+    ],
+    "links": [
+        {
+            "source": <doi: string>,
+            "target": <doi: string>
+        }, ...
+    ]
+}
+```
+
+### Display the Citation Network
+Starting a python web server:
+```sh
+   cd <path to file> &&python3 -m http.server <port>
+```
+Access to the server:
+[http://0.0.0.0/:\<port\>](http://0.0.0.0/:<port>)
+
+## Files in Directory
+- **index.html**: webpage
+- **cn.js**: javascript code for force-directed graph, text elements and legend
+- **json_text.json**: example data
+
+
+## Authors
+- Katja Ehlers
+- Merle Stahl
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