Add Tesseract

The package is named `tesseract-game` as to not conflict with the
Tesseract OCR package named `tesseract`.

tesseract-game.json

@@ -0,0 +1,15 @@
+{
+    "homepage": "http://tesseract.gg/",
+    "description": "First-person shooter featuring real-time lighting and a cooperative map editor",
+    "version": "nightly",
+    "license": "https://websvn.tuxfamily.org/filedetails.php?repname=tesseract%2Fmain&path=%2Fsrc%2Freadme_tesseract.txt",
+    "url": "https://tesseract.pupskuchen.net/latest/tesseract-nightly.zip",
+    "shortcuts": [
+        [
+            "tesseract.bat",
+            "Tesseract",
+            "",
+            "src/vcpp/tesseract.ico"
+        ]
+    ]
+}