update readme

README.md

@@ -2,9 +2,37 @@
 # CIAlign
 CIAlign documentation is now available via [ReadTheDocs](https://cialign.readthedocs.io/en/latest/)
 
+## Installation
+
+**Requirements**
+
+* python >= 3.6
+* matplotlib >= 2.1.1
+* numpy >= 1.16.3
+* scipy >= 1.3.0
+
+The easiest way to install CIAlign is using conda or pip3.
+
+**Conda**
+
+`conda install -c bioconda cialign`
+
+[link](https://anaconda.org/bioconda/cialign)
+
+**pip3**
+`pip3 install cialign`
+
+[link](https://pypi.org/project/cialign/)
+
+**Download**
+The current release of CIAlign can also be downloaded directly using [this link](https://github.com/KatyBrown/CIAlign/releases/latest),
+
+If you download the package directly, you will also need to add the CIAlign directory to your PATH environment variable as described [here](https://gist.github.com/nex3/c395b2f8fd4b02068be37c961301caa7)
+
 ## Summary
 CIAlign allows the user to:
 
+
 **Clean**
 
 * Remove sources of noise from an MSA