Add EDITING.md with placeholder customization guide

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ecisneros8

EDITING.md

@@ -0,0 +1,153 @@
+# Editing Guide — The Cisneros Group Website
+
+All content lives in plain Markdown/HTML files. No build step needed locally —
+just edit, commit, and push; GitHub Pages rebuilds the site in ~1 minute.
+
+---
+
+## Site-wide settings → `_config.yml`
+
+| Field | What it does |
+|-------|-------------|
+| `title` | Site name shown in the nav bar and browser tab |
+| `description` | Subtitle shown in the hero overlay on the home page |
+| `hero_image` | (commented out) Path to a static image that replaces the animation |
+
+**Swapping the hero animation for a photo:**
+1. Drop your image at `assets/images/hero.jpg` (any format/name works).
+2. In `_config.yml`, uncomment and update:
+   ```yaml
+   hero_image: assets/images/hero.jpg
+   ```
+3. Push — the animation is replaced with your image.
+
+---
+
+## Home page → `index.md`
+
+### Profile photo
+1. Place your photo at `assets/images/profile.jpg`.
+2. In `index.md`, find the `<div class="profile-placeholder">` block and
+   replace the entire `<div>…</div>` with:
+   ```html
+   <img src="/assets/images/profile.jpg"
+        alt="Dr. Esteban Cisneros"
+        class="profile-photo">
+   ```
+
+### Bio text
+Find the paragraph starting with `<strong>Dr. Esteban Cisneros</strong>` and
+edit the surrounding `<p>` tags. Plain text and basic HTML (`<strong>`,
+`<a href>`, `<br>`) work fine inside them.
+
+### Research interests
+Each bullet is a `<li>` inside `<ul class="interests-list">`.
+Edit or add lines following this pattern:
+```html
+<li>Your research interest here</li>
+```
+
+### News items
+Each item is a `<div class="news-item">` pair. Add a new one by copying an
+existing block and updating the date and text:
+```html
+<div class="news-item">
+  <span class="news-date">Mar 2026</span>
+  <span class="news-text">Your news text here.</span>
+</div>
+```
+Dates are freeform text — use whatever format you like.
+
+### Apply section
+Edit the paragraphs inside `<div class="apply-box">` directly.
+
+---
+
+## Research page → `research.md`
+
+### Overview paragraphs
+Edit the `<p>` tags inside the first `<section class="content-section">`.
+
+### Adding a publication
+Copy one `<li class="pub-item">` block and fill in:
+- `href="https://doi.org/…"` — the real DOI link
+- `.pub-title` — full paper title
+- `.pub-authors` — author list (bold your name with `<strong>E. Cisneros</strong>` if you like)
+- `.pub-journal` — journal name, volume, pages, year
+
+### Adding a project card
+Copy one `<div class="project-card">` block inside `.project-grid` and update
+the `<h3>` title, description `<p>`, and funding note.
+
+---
+
+## People page → `people.md`
+
+Each person is a `<li class="person-item">`. There are four groups
+(Post-Docs, PhD, MS, Undergraduate). To add someone, copy a `<li>` block
+from the appropriate group and update:
+
+- **Avatar initials** — the two-letter `<div class="person-avatar">` text
+- **Name + email** — `<a href="mailto:name@utk.edu">Full Name</a>`
+- **Role/topic** — the `<span class="person-role">` line
+
+```html
+<li class="person-item">
+  <div class="person-avatar">AB</div>
+  <div class="person-info">
+    <span class="person-name">
+      <a href="mailto:asmith@vols.utk.edu">Alice Smith</a>
+    </span>
+    <span class="person-role">Dissertation: DNS of supersonic mixing layers</span>
+  </div>
+</li>
+```
+
+To **remove** a placeholder, delete the entire `<li>…</li>` block.
+
+---
+
+## Teaching page → `teaching.md`
+
+Each course is a `<div class="course-card">`. To add a course, copy the
+existing card (or the commented-out template at the bottom of the file) and
+fill in:
+
+```html
+<div class="course-card">
+  <div class="course-code">ME 4XX · Undergraduate</div>
+  <div class="course-title">Course Title Here</div>
+  <p>Course description.</p>
+  <p class="course-meta">
+    <strong>Next offering:</strong> Spring 2027 &middot;
+    <strong>Credits:</strong> 3 hrs
+  </p>
+</div>
+```
+
+---
+
+## Quick-reference: where everything lives
+
+```
+_config.yml          ← site title, description, hero image toggle
+index.md             ← Home: bio, research interests, news, apply
+research.md          ← Research: overview, publications, projects
+people.md            ← People: group members by degree level
+teaching.md          ← Teaching: course cards
+assets/images/       ← Drop profile.jpg and hero.jpg here
+assets/css/custom.css  ← All styles (colours, layout, typography)
+assets/js/simulation.js ← Hero animation (no need to touch this)
+```
+
+---
+
+## Workflow
+
+```bash
+# Edit a file, then:
+git add <file>
+git commit -m "Update bio / add publication / etc."
+git push
+# Site rebuilds on GitHub Pages in ~1 minute.
+```