docs: add some more docs

doc/tutorial1.md

@@ -0,0 +1,45 @@
+# Tutorial 1
+
+In this tutorial we show the basics of a simple PipeWire application.
+Use this tutorial to get started and help you set up your development
+environment.
+
+## Initialization
+
+Let get started with the simplest application.
+
+```c
+#include <pipewire/pipewire.h>                                                  
+
+int main(int argc, char *argv[])
+{
+	pw_init(&argc, &argv);
+
+	fprintf(stdout, "Compiled with libpipewire %s\n"
+                        "Linked with libpipewire %s\n",
+                                pw_get_headers_version(),
+                                pw_get_library_version());
+	return 0;
+}
+```
+
+Before you can use any PipeWire functions, you need to call `pw_init()`.
+
+## Compilation
+
+To compile the simple test application, copy it into a test1.c file and
+use:
+
+```
+gcc -Wall test1.c -o test1 $(pkg-config --cflags --libs libpipewire-0.3)
+```
+
+then run it with:
+
+```
+# ./test1
+Compiled with libpipewire 0.3.5
+Linked with libpipewire 0.3.5
+#
+```
+