Add build script for SDPP.

XTMax/Apps/SDPP/.gitignore

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+*.obj
+*.map
+*.sys
+log.txt

XTMax/Apps/SDPP/.vscode/tasks.json

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+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "Build in DOSBox",
+            "type": "shell",
+            "command": "..\\..\\Tools\\DOSBox\\DOSBox.exe -conf Build.conf",
+            "options": {
+                "cwd": "${workspaceFolder}"
+            },
+            "problemMatcher": [],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            }
+        }
+    ]
+}

XTMax/Apps/SDPP/Build.conf

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+[autoexec]
+@ECHO OFF
+CLS
+MOUNT C .
+MOUNT D ..\..\Tools\BCC31
+SET PATH=D:\
+C:
+MAKE > LOG.TXT
+IF ERRORLEVEL 1 GOTO :ERROR
+EXIT
+:ERROR
+TYPE LOG.TXT
+ECHO Log saved to LOG.TXT
+PAUSE
+EXIT