added current gentooimgr

CONFIG.md

@@ -0,0 +1,17 @@
+GentooIMGR Configuration Specification
+======================================
+
+
+---------------
+Getting Started
+---------------
+
+If you want your own customized gentoo image, simply copy the gentooimgr/configs/base.json.example file:
+
+```sh
+cp gentooimgr/configs/base.json.example gentooimgr/myconfig.json
+# modify your config file. It needs to be saved in the directory directly above or within gentooimgr to be
+# included in the generated iso file and therefore mounted automatically; otherwise, copy it to the live image
+python -m gentooimgr -c gentooimgr/myconfig.json install
+```
+