task 35, made two sql tables (evuventures#43)

* Add technical documentation to README (task 17)

* added caching, used functools already built in python, and used lru cache, i tested it and it should be working, there is a test function comemnted out in main. i added some imports due to when i ran it, it wasnt finding the folders, can remove those if you want as it is probably me and my environment.

* addressed comments on inital commit, creates a test file in the ./src/tests folder directory and used the unittest suite to explore the conditions when the function would return an exception, valid/invalid data. made a seperate file for cached_get,.

* fixed failing build

* task 35 SQL script to run in local postgres

Author: gmanhas12

webscraper/database/init_db.sql

@@ -0,0 +1,16 @@
+-- Create users table
+CREATE TABLE users (
+    id SERIAL PRIMARY KEY,
+    username VARCHAR(255) NOT NULL UNIQUE,
+    password_hash VARCHAR(255) NOT NULL
+);
+
+-- Create products table
+CREATE TABLE products (
+    id SERIAL PRIMARY KEY,
+    product_name VARCHAR(255) NOT NULL,
+    price NUMERIC(10,2) NOT NULL,
+    url TEXT NOT NULL,
+    user_id INTEGER NOT NULL,
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+);