📦 day15 - updating index step by step

Author: ArnabKumarRoy02

Day 15/README.md

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+# Day 15
+
+Today we will learn to make changes step by step.
+
+## Problem Statement:
+The index is really useful, because it allows us to be precise about which changes we want to include in each commit!
+
+### Files:
+ - hammer
+ - bottle
+ - sugar_cube
+
+### Question:
+ - Make changes to all three objects, to form a logical sequence of events!
+ - Only add one of these changes!
+ - And make a commit.
+ - Make a second commit that only records a single change.
+ - And a third one.
+
+<div align="center">
+  <img src="https://github.com/ArnabKumarRoy02/Learn-git/assets/86621483/6af4d455-181b-4adf-bbc8-4c88cf10012f" width=400>
+  <p>Diagram of the problem</p>
+</div>
+
+## Solution:
+
+1. Make changes in all the three files and save it.
+```bash
+nvim hammer bottle sugar_cube
+```
+
+2. Add only one file and make a commit.
+```bash
+git add hammer
+git commit -m "hammer added"
+```
+
+3. Make a second commit that only records a single change.
+```bash
+git add bottle
+git commit -m "water bottle added"
+```
+
+4. Similarly, add the final one.
+```bash
+git add sugar_cube
+git commit -m "sugar cube added"
+```
+
+<div align="center">
+  <img src="https://github.com/ArnabKumarRoy02/Learn-git/assets/86621483/c2b8196b-d461-477a-956a-903abbc1e85a" width=400>
+  <p>Diagram of the solution</p>
+</div>