Add $ make install, so generation, and format README for GitHub

[alichtman]

Follow up on #15

[andikleen]

Thanks. prefix should also be used for the manual page install, not just bindir Then everything can be moved with prefix.

[alichtman]

A few more changes are needed to get the so file into a usable state, but I won't have time to write it tonight.

[alichtman]

I ended up implementing what I needed this library for in Python instead of using the .so I was generating.

If you'd like to merge this, please go ahead. I likely won't be working on it any further.

From the tip of this branch:

# Testing lz4jsoncat works as expected

lz4json on  master [$] via 💎 v2.5.1 took 147ms 
11:22:58 PM ➜ make clean && make lz4jsoncat && ./lz4jsoncat '/Users/alichtman/Library/Application Support/Firefox/Profiles/gp1611vt.default-1524903360130/sessionstore-backups/recovery.jsonlz4' | head -c 200
cc -g -O2 -Wall    lz4jsoncat.c  -I/usr/local/Cellar/lz4/1.9.4/include -L/usr/local/Cellar/lz4/1.9.4/lib -llz4 -o lz4jsoncat
{"version":["sessionrestore",1],"windows":[{"tabs":[{"entries":[{"url":"https://www.insta360.com/support/supportcourse?post_id=17067&locale=en-us","title":"ReFrame Plugin Tutorial","cacheKey":0,"ID":2


# Testing `make all` works as expected

lz4json on  master [$?] via 💎 v2.5.1 
11:23:41 PM ✗ make clean && make all                                                                                                                                                                           
cc -g -O2 -Wall    lz4jsoncat.c  -I/usr/local/Cellar/lz4/1.9.4/include -L/usr/local/Cellar/lz4/1.9.4/lib -llz4 -o lz4jsoncat
cc -g -O2 -Wall -fPIC -shared -g -o liblz4json.so lz4jsoncat.c -I/usr/local/Cellar/lz4/1.9.4/include -L/usr/local/Cellar/lz4/1.9.4/lib -llz4

lz4json on  master [$?] via 💎 v2.5.1 took 1s 
11:23:49 PM ➜ ll                                                                                                                                 
drwxr-xr-x alichtman staff 512 B  Sat Sep 16 23:22:58 2023  .git
drwxr-xr-x alichtman staff  96 B  Sat Sep 16 23:23:49 2023  liblz4json.so.dSYM
drwxr-xr-x alichtman staff  96 B  Sat Sep 16 23:23:49 2023  lz4jsoncat.dSYM
.rw-r--r-- alichtman staff 6.0 KB Sat Sep 16 04:23:45 2023  .DS_Store
.rwxr-xr-x alichtman staff  34 KB Sat Sep 16 23:23:49 2023  liblz4json.so
.rwxr-xr-x alichtman staff  34 KB Sat Sep 16 23:23:49 2023  lz4jsoncat
.rw-r--r-- alichtman staff 387 B  Sun Aug 27 21:30:37 2023  lz4jsoncat.1
.rw-r--r-- alichtman staff 2.8 KB Sat Sep 16 23:22:58 2023  lz4jsoncat.c
.rw-r--r-- alichtman staff 886 B  Sat Sep 16 04:29:39 2023  Makefile
.rw-r--r-- alichtman staff 1.1 KB Sat Sep 16 01:37:42 2023  README.md


# make install / uninstall works correctly

lz4json on  master [$?] via 💎 v2.5.1 took 49ms 
11:23:52 PM ➜ sudo make install                                                                                                                                                                                    
mkdir -p /usr/local/bin/ /usr/local/man/
cp lz4jsoncat.1 /usr/local/man/
cp lz4jsoncat /usr/local/bin/
mv liblz4json.so /usr/local/lib/


lz4json on  master [$?] via 💎 v2.5.1 took 112ms 
11:24:33 PM ➜ sudo make uninstall   
rm /usr/local/bin/lz4jsoncat /usr/local/man/lz4jsoncat.1 /usr/local/lib/liblz4json.so