chore: update readme

README.md

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+# StupidFS
+
+```mermaid
+block-beta
+  block
+          a["boot block"]
+          b["super block"]
+          c["inodes"]
+          d["inodes"]
+          f["data"]
+          g["data"]
+          h["data"]
+  end
+```
+
+```mermaid
+block-beta
+ columns 1
+  block:a
+    ab0["block 0"]
+    ab1["block 1"]
+    ab2["block 2"]
+    ab3("...")
+    ab4["block 99"]
+  end
+
+  block:b
+    bb0["block 0"]
+    bb1["block 1"]
+    bb2["block 2"]
+    bb3("...")
+    bb4["block 99"]
+  end
+
+  block:c
+    cb0["block 0"]
+    cb1["block 1"]
+    cb2["block 2"]
+    cb3("...")
+    cb4["block 99"]
+  end
+
+  ab0 --> bb0
+  bb0 --> cb0
+```
+
+## License
+
+<img src="https://opensource.org/wp-content/themes/osi/assets/img/osi-badge-light.svg" align="right" height="128px" alt="OSI Approved License">
+
+StupidFS is dual-licensed under both CeCiLL-B and BSD-3-Clause licenses.
+
+The full text of the CeCiLL-B license can be accessed via [this link](https://cecill.info/licences/Licence_CeCILL-B_V1-en.html) and is also included in [the license file](LICENSE) of this software package.
+
+The full text of the BSD-3-Clause license can be accessed via [this link](https://opensource.org/licenses/BSD-3-Clause) and is also included in [the license file](LICENSE.BSD3) of this software package.

README.org

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-* StupidFS
-
-
-*** License
-
-StupidFS is dual-licensed under both CeCiLL-B and BSD3 licenses