improved documentation

README.md

 # ohsome2X
 
+## Install
+```bash
+1. Clone the repo:
+
+    git clone ssh://git@gitlab.gistools.geog.uni-heidelberg.de:2022/giscience/big-data/ohsome/libs/ohsome2x.git
+
+OR
+
+    git clone https://gitlab.gistools.geog.uni-heidelberg.de/giscience/big-data/ohsome/libs/ohsome2x.git
+
+2. Run the npm installer inside repo
+    
+    cd ohsome2x
+    npm install
+
+3. Build the project
+
+    npm run build
+```
+
+## Usage
+There are two ways how you can use ohsome2x.
+
+1. Use it as library in another project. You find the built library in the `/dist` folder after executing `npm run build`
+2. Use the interactive command line interface. Run: `node ./ohsome2x-cli/ohsome2x-cli.js`
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