Add some introduction to readme and brush up the formatting

README.md

@@ -1,5 +1,8 @@
 # Simple dd-like image writer with additional security checks.
 
+This tool verifies your image automatically. The block size is currently set to
+1 MiB, which should be enough to avoid trouble.
+
 ```
 writeimg v0.2.0, Rev. 5323932-dirty
 In honor of SwePwnage - the OG disk destroyer
@@ -20,12 +23,16 @@ Args:
 
 ## Testing
 
+```
 dd if=/dev/zero of=./disk.img bs=1M count=1024
 losetup -fP ./disk.img
 losetup -a
 losedup -d /dev/loop0
+```
+
+## Inspiration
 
 See:
-    https://github.com/landley/toybox/blob/master/toys/posix/dd.c
-    https://github.com/illiliti/libudev-zero
-    https://github.com/LoupVaillant/Monocypher
+    - https://github.com/landley/toybox/blob/master/toys/posix/dd.c
+    - https://github.com/illiliti/libudev-zero
+    - https://github.com/LoupVaillant/Monocypher