Added printer setup

docs/printing.md

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+Control dashboard: http://localhost:631
+
+---
+
+# 🧾 Core controls
+
+```bash
+lp file.pdf
+```
+
+```bash
+-d PRINTER        # choose printer
+-n NUM            # number of copies
+-t "TITLE"        # job name
+-q NUM            # priority (1–100, higher = sooner)
+```
+Printer at the house: `HP_OfficeJet_Pro_7740`. I can't make printing without USB work...
+
+---
+
+## If printer stuck:
+
+```bash id="enable1"
+sudo cupsenable HP_OfficeJet_Pro_7740
+```
+
+---
+
+
+```bash id="accept1"
+sudo cupsaccept HP_OfficeJet_Pro_7740
+```
+
+
+```bash id="cancel1"
+cancel -a HP_OfficeJet_Pro_7740
+```
+
+
+#### 🧪 Verify state
+
+```bash id="check1"
+lpstat -p -d
+```
+
+You want:
+
+```
+HP_OfficeJet_Pro_7740 idle, accepting jobs
+```
+
+---
+
+# 📄 Page selection
+
+```bash
+-P 1-5,8,10-20    # specific pages / ranges
+-o page-ranges=   # same as -P (sometimes more reliable)
+```
+
+Example:
+
+```bash
+lp -o page-ranges=142-184 file.pdf
+```
+
+---
+
+# 📐 Layout & scaling
+
+```bash
+-o fit-to-page
+-o scaling=100        # percent
+-o media=A4
+-o orientation-requested=4   # landscape
+```
+
+Orientation values:
+
+* `3` = portrait
+* `4` = landscape
+
+---
+
+# 🧠 Duplex (double-sided)
+
+```bash
+-o sides=one-sided
+-o sides=two-sided-long-edge
+-o sides=two-sided-short-edge
+```
+
+---
+
+# 📚 Multiple pages per sheet
+
+```bash
+-o number-up=2
+-o number-up=4
+-o number-up=6
+-o number-up=9
+-o number-up=16
+```
+
+---
+
+# 🖼️ Image handling
+
+```bash
+-o fit-to-page
+-o position=center
+-o saturation=100
+-o brightness=100
+```
+
+---
+
+# 🎨 Color / quality
+
+```bash
+-o ColorModel=Color
+-o ColorModel=Gray
+
+-o print-quality=3   # draft
+-o print-quality=4   # normal
+-o print-quality=5   # high
+```
+
+---
+
+# 📦 Paper / tray
+
+```bash
+-o media=A4
+-o media=Letter
+-o InputSlot=tray1
+-o InputSlot=manual
+```
+
+---
+
+# 🔁 Job handling
+
+```bash
+-H hold            # hold job
+-H resume          # resume job
+-H immediate       # print ASAP
+```
+
+---
+
+# 🔍 Debug / info
+
+```bash
+lpstat -p -d       # printers + default
+lpstat -o          # jobs
+lpoptions -l       # printer-specific options
+```
+
+---
+
+# 🔥 Real-world example (what you actually want)
+
+```bash
+lp -d HP_LaserJet \
+   -o page-ranges=142-184 \
+   -o sides=two-sided-long-edge \
+   -o media=A4 \
+   -o print-quality=5 \
+   file.pdf
+```
+
+---
+
+# ⚠️ Important reality check
+
+Not all printers support all options. The **real supported ones** come from:
+
+```bash
+lpoptions -p PRINTER_NAME -l
+```
+
+That command is gold—use it.
+
+---
+
+If you want, tell me your **printer model**, and I’ll give you a *perfect command tuned to it* (no guessing, no trial and error).