WIP of readme

README.md

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+libscary: An (scary) scalable array library in C 
+================================================
+
+This is one of those rotten dynamic array libraries, but wait, just take a look.
+
+```c
+int *a = scary_new(sizeof(int));
+```
+Look at this LHS; it looks like an ordinary C array, but
+
+```c
+printf("length: %zu\n", scary_length(a));
+```
+they knows their length by themselves 😱.
+
+```c
+scary_push(a, -1);
+scary_push(a, 42);
+```
+You can push elements with automatic memory extension,
+as much as you want.
+
+And you'll see magic here:
+
+```c
+int i = a[1];
+```
+You can read/write them as an ordinary C array without any overhead 😱😱.
+
+```c
+printf("content: %d\n", i);
+```
+Then it prints `42`. Happy ending. 🤔