Install dependencies from requirements.txt missing in README.md (aimacode#1039)

* update in Readme.md

* updated as per the suggestions in the review.

Author: thesagarsehgal

README.md

@@ -31,6 +31,10 @@ To download the repository:
 
 `git clone https://github.com/aimacode/aima-python.git`
 
+Then you need to install the basic dependencies to run the project in your system:
+
+`pip install -r requirements.txt`
+
 You also need to fetch the datasets from the [`aima-data`](https://github.com/aimacode/aima-data) repository:
 
 ```