added temporary syscall list

docs/syscalls.md

@@ -0,0 +1,44 @@
+## Syscall list
+This list is not complete, but the numbers and the arguments are most likely final
+
+- `exit(int)`
+- `void *mmap(void *addr, size_t length, int prot)`
+- `void munmap(void *addr, size_t length)`
+- `void closeHandle(void *handle)`
+- `void *duplicateHandle(void *handle)`
+- `void *createService(char name[16], int maxSessions)`
+- `void *connectToService(char name[16])`
+- `void *replyAndReceive(int * handleEventOut, void ** handles, int handleCount, uint8_t data[256])` - returns a handle if there is a new connection or if a handle has closed the connection
+- `void *create_shared(void **handle_out, void* addr, size_t length, int prot, void *tgt_process)` - returns a handle for the other process to map shared memory
+- `void *mmap_shared(void* handle, void* addr)`
+- `int fork()`
+- `int vfork()` - Used for threading
+- `int getpid()`
+- `int getppid()`
+- `int setppid()`
+
+## Example code
+Bare-metal (no libc) hello world
+
+    int main() {
+        auto tty_handle = connectToService("tty:u");
+        if(!tty_handle)
+            exit(1);
+        union {
+            struct {
+                int cmd_id;
+                char text[252];
+            }__attribute__((packed))
+            uint8_t data[256];
+        } cmdbuf;
+        cmdbuf.cmd_id = 1; //1 == puts()
+        const char* s = "Hello, World!";
+        int i;
+        for(i=0;s[i];i++)
+            cmdbuf.text[i]=s[i];
+        cmdbuf.text[i]=0;
+        replyAndReceive(nullptr, &tty_handle, 1, cmdbuf.data); //Passing nullptr to handleEventOut will not wrote a event handle number
+        closeHandle(tty_handle);
+        exit(1);
+    }
+