added explanation readme file

Author: marleomac3

lesson_04/ljmcwilliams/README.md

@@ -0,0 +1,59 @@
+In this lesson, I explored the differences between Java and JavaScript. Despite their similar names, these languages have distinct features.
+
+- ## Key Differences
+- ### Document Preparation:
+
+    - Java requires preparation before defining variables and functions.
+JavaScript has more flexibility with variable definitions.
+
+- ### User Input:
+
+    - In Java, I used the Scanner class to prompt the user for number input.
+This required importing Java's Scanner class.
+In JavaScript, there is no built-in Scanner class, so I used Node.js as a workaround.
+With Node.js, I utilized process.stdin for input and process.stdout for output (similar to console.log).
+
+- ### Loop Control:
+
+    - Both languages allow for loops to be exited early, but the methods differ:
+In Java, using a break statement within the loop will terminate it.
+In JavaScript, I opted for read.close(), which achieves a similar effect.
+
+- ### Variable Declaration:
+
+    - Java requires explicit declaration of variable types.
+JavaScript automatically assigns variable types.
+- ## Loop Behavior
+Both languages share similarities in loop functionality:
+
+- **For Loops**:
+    - Take three expressions.
+
+- **If Statements**:
+    - Accept a condition and can be nested.
+
+- **Java Example**
+```java
+for (int i = 2; i < userInput; i++) {
+            if ((userInput / i) == (int) (userInput / i)) {
+                System.out.println(userInput + " is not a prime number.");
+                isConditionMet = true;
+                break;
+            }
+        } if (!isConditionMet) {
+            System.out.println(userInput + " is a prime number.");
+        }
+```
+- **JavaScript Example**
+```javascript
+for (let i = 2; i < answer; i++) {
+            if ((answer / i) == parseInt(answer / i)) {
+                console.log(answer + " is not a prime number.");
+                isConditionMet = true;
+                read.close();
+            }
+        } if (!isConditionMet) {
+            console.log(answer + " is a prime number.");
+            read.close();
+        }
+```