Add README.md and requirements.txt

README.md

+# A random walk visualization
+
+## Installation
+
+### Install pip
+
+Follow the [instructions](https://pip.pypa.io/en/stable/installing/).
+
+### install `virtualenv`
+
+```bash
+pip install --user virtualenv
+```
+
+### Install dependencies
+
+Create virtual environment:
+
+```bash
+virtualenv .env
+```
+
+Activate virtual env:
+
+```bash
+source .env/bin/activate
+```
+
+Install dependencies:
+
+```bash
+pip install -r requirements.txt
+```
+
+## Usage
+
+Run python script (once virtualenv is activated):
+
+```bash
+python srw.py
+```

requirements.txt

+numpy
+matplotlib
\ No newline at end of file