add readme

README.md

+# Nuclei signal quantification
+
+## Installation
+
+### Create a new `conda` environment
+
+* Using the `environment.yml` file, create a new environment with all the necessary dependencies:
+
+```bash
+cd nuclei_quantification
+conda env create -f environment.yml
+```
+
+## Usage
+
+* Activate the environment:
+
+```bash
+conda activate nuclei-quantification
+```
+
+* Launch the Notebook server
+
+```bash
+jupyter notebook
+```