Added NEWS.md

NEWS.md

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+# Qucs-S 0.0.24
+
+## New simulation types
+
+* Added S-parameter simulation using Ngspice and Xyce backends; Ngspice>=37 requiered #84, #79
+* Added FFT analysis with Ngspice backend #88
+
+## GUI improvements
+
+* Implemented dark desktop theme support #66
+* Implemented manual setting of the X-axis markers postion #92
+* Added separate setting for schematic and application font
+
+## Qt5 support
+
+* Removed QtScript dependency (thanks @Zergud) #77
+* Fixed Qt5.15 deprecation warnings #75
+
+## Component libraries
+
+* Added quartz crystal library (Crystal.lib); the quartz model is optimized for filter design;
+* Added TL431 device in Regulators library;
+
+## General bugfixes
+
+* Fixed crash on HB simulation with XYCE #28
+* Fixed empty path for working directory #86
+* Show error when schematic contains only DC simulation (no effect for Ngspice) #83
+* Fixed layout in arrow properties dialog #81
+* Fixed drag'n'drop operation from left dock to schematic
+* Fixed newlines in SPICE resitors #62
+* Fixed crash on Wayland #76
+
+## Documentation and examples
+
+* Added offline PDF tutorial; the link for old Qucs tutorial removed from Help menu #78
+* Added examples for new S-parameter and FFT simulations
+* Fixed distortion simulation example #83
+
+## Known issues
+
+* Parameter sweep doesn't work when using the Fourier simulation with XYCE backend #73
+* Netlister may produce duplicate .SUBCKT entry when using the same component from user and system library #82
+
+# Qucs-S 0.0.23
+
+## Qt5 support and new features
+
+* The Qucs-S application is now fully ported to Qt5 and could be compiled on modern Linux distributions; #72 #32
+* Added two new component libraries: BF998 and Tubes containing two-gate MOSFET and vacuum tubes (triodes and penthodes provided by @olegkapitonov ) models;
+* Windows binary switched to 64-bit build. The old 32-bit binaries are not provided anymore;
+* Ngspice is now the default simulation kernel on the first application start;
+* The Qucs-S doesn't use a shared settings file with Qucs anymore #71
+
+## General bugfixes
+
+* Fixed "Show last netlists" not showing SPICE netlist when SPICE engine is selected #41
+* Use system default sans serif font instead of "Helvetica", because "Helvetica" cannot be rendered correctly on some platforms;
+* Fixed .INCLUDE directive support with SpiceOpus #16
+* Partially fixed .FOUR simulation support for Xyce backend #73
+* Removed warning about experimental feature in the simulation dialog. Qucs-S is considered to be stable now;
+