change folder structure and updated readme

README.md

@@ -4,15 +4,21 @@
 > detailed cad model of the [msre](https://en.wikipedia.org/wiki/Molten-Salt_Reactor_Experiment) (molten salt reactor experiment), operated by oak ridge national laboratory 1965-69.
 
 ## msre core
-![](report/msre.png)
-[report/msrecore.pdf](report/msrecore.pdf) lists reference of the msre core design, documented in the old msre reports and located in the repository [github.com/openmsr/msr-archive](https://github.com/openmsr/msr-archive/blob/master/README.md).
+![](core/docs/msre.png)
+[core/msrecore.pdf](core/docs/msrecore.pdf) lists reference of the msre core design, documented in the old msre reports and located in the repository [github.com/openmsr/msr-archive](https://github.com/openmsr/msr-archive/blob/master/README.md).
 
 the work-in-progress cad model can be found [here](https://cad.onshape.com/documents/4f04f63bfd4138a61a54b3f8/w/11cb17d9ef25bb27f8ada6c0/e/72f417dd8eb3e2fa4f9ccb9e) on onshape.
 
+note that this work and the cad model is under the GNU General Public License v3.0
+
+## heat exchanger
+
+### msre primary heat exchanger
+
+### msre radiator
+
 ---
 
 please contact [me](https://github.com/aslakstubsgaard) if you want to contribute.
 
 ---
-
-note that this work and the cad model is under the GNU General Public License v3.0