Gazebo: Add Pik-20B sailplane

Gazebo/config/pik_20b_sailplane.param

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+TKOFF_TDRAG_ELEV 100.000000
+TKOFF_TDRAG_SPD1 10.000000
+TKOFF_ROTATE_SPD 25.000000
+TKOFF_THR_SLEW   10.000000
+ARSPD_FBW_MIN    28.000000
+ARSPD_FBW_MAX    60.000000
+TRIM_THROTTLE    40.000000
+LIM_ROLL_CD      6000.000000
+LIM_PITCH_MAX    1600.000000
+LIM_PITCH_MIN    -3000.000000
+ACRO_ROLL_RATE   90.000000
+ACRO_PITCH_RATE  90.000000
+ACRO_YAW_RATE    90.000000
+TRIM_ARSPD_CM    4400.000000
+SCALING_SPEED    44.000000
+TRIM_PITCH_CD    100.000000
+ARMING_RUDDER    0.000000
+RLL_RATE_P       0.406230
+RLL_RATE_I       0.406230
+RLL_RATE_D       0.014926
+RLL_RATE_FF      1.097314
+RLL_RATE_FLTT    3.183099
+RLL_RATE_FLTD    10.000000
+PTCH2SRV_TCONST  0.750000
+PTCH2SRV_RMAX_UP 75.000000
+PTCH2SRV_RMAX_DN 75.000000
+PTCH2SRV_RLL     0.350000
+PTCH_RATE_P      0.649316
+PTCH_RATE_I      2.388867
+PTCH_RATE_D      0.018863
+PTCH_RATE_FF     2.388867
+PTCH_RATE_FLTT   2.122066
+PTCH_RATE_FLTD   10.000000
+YAW_RATE_ENABLE  1.000000
+NAVL1_PERIOD     10.000000
+TECS_LAND_ARSPD  30.000000
+TECS_LAND_THR    0.000000
+TECS_LAND_SINK   1.000000
+SERVO1_MIN       1000.000000
+SERVO1_MAX       2000.000000
+SERVO2_MIN       1000.000000
+SERVO2_MAX       2000.000000
+SERVO3_MIN       1000.000000
+SERVO3_MAX       2000.000000
+SERVO4_MIN       1000.000000
+SERVO4_MAX       2000.000000
+ARSPD_TYPE       0.000000

Gazebo/docs/Pik-20B_Sailplane.md

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+# Pik-20B sailplane
+
+Model for a full size Pik-20B sailplane.
+
+![pik_20b_sailplane_v1](https://github.com/ArduPilot/SITL_Models/assets/24916364/342ec2a4-525e-4589-8814-279cda15df5d)
+
+
+## Usage
+
+Gazebo and the plugins should be installed as per the [ArduPilot Gazebo Plugin](https://github.com/ArduPilot/ardupilot_gazebo) instructions.
+
+Update the `GZ_SIM_RESOURCE_PATH` to include these models:
+
+```bash
+export GZ_SIM_RESOURCE_PATH=$GZ_SIM_RESOURCE_PATH:\
+$HOME/SITL_Models/Gazebo/models:\
+$HOME/SITL_Models/Gazebo/worlds
+```
+
+#### Run Gazebo
+
+```bash
+$ gz sim -v4 -r sailplane_runway.sdf
+```
+
+#### Run ArduPilot SITL
+
+```bash
+$ sim_vehicle.py -v ArduPlane -f JSON --add-param-file=$HOME/SITL_Models/Gazebo/config/pik_20b_sailplane.param --console --map
+```
+