Add Chengelog file

Author: gdevic

CHANGELOG.md

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+# Changelog
+
+All notable changes to Z80 Explorer are documented in this file. For details, always see "Z80Explorer" main document.
+
+The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/)
+
+## [1.07] - 2025-11-09
+### Added
+- New implementation of the schematic code
+- Added Schematic Edit dialog
+- Multiple ways to draw nets
+-- Active (legacy view), Pull-up (static), Gate-less (static) and Gate-less no Pull-up (static)
+- More Waveform draving options
+-- Added fill for logic 0 or for logic 1
+-- Added "Sync" button that syncs waveform views' cursors
+-- Added Merge menu and Save option
+- Added patchHex() command
+- Added execApp() command
+- Load and run ZX Spectrum SNA format: load("sna.js")
+- Added socket server, port 12345, and sample sock.py client (disabled at the moment)
+
+### Improved
+- Schematic engine
+- Save and restore waveform cursors across sessions
+- Better Colors management
+- Added autocompleter to Find
+- Added background checkered pattern
+- Added context menu to toggle overlay
+- Added context menu to save image view as PNG
+- Waveform add vertical scroll, Δ= and Sync buttons
+- Simulation engine performance improvements
+- Edit Buses allows extended selection for Delete
+- Updated resources
+-- Added names of all registers, updated netnames etc.
+-- Added waveform-2 with PLA signals
+- Documentation
+
+### Fixed
+- More robust loading of nets and buses
+- Make ZX window single, not closable