add some entry ; add a script to get tool README

catalog.yaml

@@ -281,6 +281,11 @@ mosh:
   website: https://mosh.org/
   github: mobile-shell/mosho
 
+navi:
+  desc: Interactive cheatsheet tool for the command-line 
+  github: denisidoro/navi
+  tag: rust
+
 ndcu:
   desc: a disk usage analyzer with an ncurses interface
   website: https://dev.yorhel.nl/ncdu
@@ -367,6 +372,13 @@ slurp:
   desc: put whole input in memory before processing ; this allow to overrite input file ; like `sed -i` ; prefer `sponge` from moreutils package
   shell: cat > /dev/shm/slurp_$$ && cat /dev/shm/slurp_$$ ; rm /dev/shm/slurp_$$
 
+sk:
+  fullname: skim
+  desc: general fuzzy finder
+  github: lotabout/skim
+  cargo: skim
+  tag: rust
+
 so:
   desc:  A terminal interface for Stack Overflow 
   github: samtay/so