Add LaTeX-formatted README for ICSP homework problem set

[Copilot]

Adds a structured LaTeX README (README.tex + compiled README.pdf) documenting six image-processing code modifications across three homework problems.

Document structure

• Drive link prominently framed at the top
• Problem 2-1 — Kernel convolution generalisation
  • (a) Hard-coded 3×3 → 5×5: update KERNEL_SIZE, kernel array, and half = KERNEL_SIZE / 2
  • (b) Run-time odd n×n: validates n % 2 != 0 and n > 1, exits with stderr message otherwise
• Problem 2-2 — In-place 90° rotation (output dims = H×W)
  • (a) CW: (x,y) → (H−1−y, x)
  • (b) CCW: (x,y) → (y, W−1−x)
• Problem 2-3 — Crop + resize pipeline
  • (a) crop(src, x0, y0, w, h) — copies rectangle [x0, x0+w) × [y0, y0+h)
  • (b) crop_and_resize — nearest-neighbour scale to displayW × displayH
  • (c) Full edge-case table: negative origin, non-positive dimensions, out-of-bounds region, non-positive display size, NN clamp, NULL propagation

Other files

• README.md updated to reference .tex source and drive link
• .gitignore excludes LaTeX intermediate artefacts (.aux, .log, .out, .toc, etc.)

Original prompt

Prepare a Latex formatted readme which explains each of the following modifications to a code file containing a single program 6 times to solve the following homework problems:
(ps: mention drive link at the top, as such-)

"drive link to code files for each problem" (the explanations to which are presented here itself):
"https://drive.google.com/drive/folders/1oU7uNtzw4zDzvH8hW310cTP0fcf66ybJ?usp=sharing"

Problem 2-1. Socialize with other pixels [40 points]
(a) [20 points] Take the code for convolving with a 3 by 3 kernel and modify it to
use a 5 by 5.
(b) [20 points] Then, modify it to use any odd n > 1. Even numbers should be
rejected with an error message.
NOTE: You must use the given codebase for 5×5 for the following questions. Please
provide the required code as per the question.
Problem 2-2. Take a left to go right [20 points]
Take an image - a rectangular one - and turn it:
(a) [10 points] Clockwise by 90 degrees
(b) [10 points] Counter-clockwise by 90 degrees
Problem 2-3. Reshaping reality (kind of) [40 points]
(a) [15 points] Take any image, a point P=(x, y), and two values w and h and
produce a cropped image, where the top left corner is P, and which has width
w and height h.
(b) [15 points] Additionally, take two more values displayW and displayH and
produce a stretched/squeezed image. That is, the cropped bit of the image of
width w and heigh h, should now be stretched/squeezed into a new image of
width displayW and height displayH.
(c) [10 points] Take a note of all the safety checks/edge cases that you have implemented.

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