add README.md, HACKING.md, TODO and COPYING

TODO

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+ - add an --insecure option as by default, SSL should always be used
+ - add debug printing using better means that stderr printfs
+ - fuse can log to syslog
+ - write documentation
+ - create read-only offline mode
+ - allow to control disk cache size
+ - replace atol and atoi with strtol with proper error checking
+ - find permanent solution for --no-as-needed on Ubuntu
+ - make buckets ordered so that queries and insertions can be done using bisection
+ - make array of children of h_entry ordered for quicker member search
+ - use __attribute__ ((warn_unused_result));
+ - replace sizeof for key, name and hash with #define-ed values
+ - use less realloc but instead only realloc to double the size when array gets full
+ - store more efficient structure on disk (for example by making filenames zero terminated)
+ - make h_entry more efficient in memory (for example by making filenames zero terminated)
+ - when handling device/get_changes, make sure to only use the latest revision of the same file-/folderkey
+ - allow different cache directory (useful for running test suite)
+ - delete old files in cache that have been updated
+ - delete patches in cache that have been applied
+ - check the hash of all files in the cache on startup
+ - after uploading a file it is immediately downloaded - instead, the existing local file should be used by checking the remote hash
+ - add an option to only call device/get_status in configurable intervals
+ - write man pages