Adds empty app and icon.

.gitignore

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+/.idea/

README.md

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 # t-rex-runner
 Flipper Zero port of Chrome's running T-rex game
+
+## Compiling
+
+You need a full source of the [Flipper Zero firmware](https://github.com/flipperdevices/flipperzero-firmware/tree/release),
+take the `release` branch to build for the stable release.
+
+Copy or symlink this folder as `flipperzero-firmware/applications_user/t-rex-runner`.
+
+Run the build from the root of the firmware folder:
+```
+./fbt firmware_t-rex-runner
+```
+
+If you have Flipper Zero attached to USB, you can immediately compile and run the app on device:
+```
+./fbt launch_app APPSRC=applications_user/t-rex-runner
+```

application.fam

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+App(
+    appid="t-rex-runner",
+    name="T-Rex runner",
+    apptype=FlipperAppType.EXTERNAL,
+    entry_point="trexrunner_app",
+    cdefines=["APP_TREXRUNNER"],
+    requires=["gui"],
+    stack_size=8 * 1024,
+    fap_category="Games",
+    fap_icon="trexrunner_icon.png",
+    order=36,
+)

trexrunner.c

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+#include <furi.h>
+#include <furi_hal.h>
+#include <gui/gui.h>
+#include <input/input.h>
+#include <stdlib.h>
+
+int32_t trexrunner_app(void* p) {
+  UNUSED(p);
+
+  return 0;
+}