docs: add sibo sdk docs

my C is rusty it seems

code/hellorld/hello.c

@@ -0,0 +1,15 @@
+/*
+ * hello.c
+ *
+ * Hellorld application using Psion's "CLIB" - just plain C, no Psion extensions
+ */
+
+#include <stdio.h>
+
+int main(VOID) {
+	printf("Hellorld!");
+	// Wait for a key to be pressed
+	getchar();
+	// Exit, not sure why 0 is being passed as it's a void? But this is the SDK example code
+	return(0);
+}

code/hellorld/hello.pr

@@ -0,0 +1,5 @@
+#system epoc img
+#model small jpi
+
+#compile hello
+#link hello

utils/tsc

@@ -1,2 +1,5 @@
 #!/usr/bin/env bash
-EMU2_DRIVE_C=$HOME/.bin/psion-sibo-sdk EMU2_DRIVE_D=`pwd` EMU2_DEFAULT_DRIVE=D $HOME/.bin/emu2 $HOME/.bin/psion-sibo-sdk/TS/SYS/TSC.EXE $1 $2 -- 'PATH=%PATH%;C:\DOS;C:\TS\INCLUDE;C:\TS\SYS;C:\TS\LIB;C:\SIBOSDK\SYS;'
+
+# TODO: Ensure all positional parameters get copied in properly, regardless of how many there are. Always before --
+
+EMU2_DRIVE_C=$HOME/.bin/psion-sibo-sdk EMU2_DRIVE_D=$(pwd) EMU2_DEFAULT_DRIVE=D $HOME/.bin/emu2 $HOME/.bin/psion-sibo-sdk/TS/SYS/TSC.EXE $1 $2 -- 'PATH=%PATH%;C:\DOS;C:\TS\INCLUDE;C:\TS\SYS;C:\TS\LIB;C:\SIBOSDK\SYS;'