Initial commit
Implement a very simple hashtable.

It can only hash string objects as keys.
Does not support NULL values as keys.
Does not support collision resolution at the moment.
Write about the limitations of the current implementation in the README.
Implement a clear function which will free up all the malloc'd memory.
Free the memory that you allocated, don't play with other people's
memory.
Fix the return type of get.

It should return void * rather than char *.
Store two values in the hashtable, to test out how it does.
Add Makefile
 #define 255 as a macro.
Merge simple-hashtable.