README.md: Add termux installation.

[kcubeterm]

lsd is now available in termux by termux/termux-packages#5868

[codecov-commenter]

Codecov Report

Merging #422 into master will increase coverage by 3.22%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #422      +/-   ##
==========================================
+ Coverage   73.88%   77.11%   +3.22%     
==========================================
  Files          19       34      +15     
  Lines        2026     3246    +1220     
==========================================
+ Hits         1497     2503    +1006     
- Misses        529      743     +214     

Impacted Files	Coverage Δ
src/flags.rs	0.00% <0.00%> (-68.21%)	⬇️
src/main.rs	0.00% <0.00%> (ø)
src/meta/mod.rs	17.92% <0.00%> (ø)
tests/integration.rs	100.00% <0.00%> (ø)
src/config_file.rs	17.80% <0.00%> (ø)
src/flags/total_size.rs	91.89% <0.00%> (ø)
src/flags/icons.rs	86.33% <0.00%> (ø)
src/flags/layout.rs	89.55% <0.00%> (ø)
src/flags/date.rs	88.54% <0.00%> (ø)
src/flags/dereference.rs	92.10% <0.00%> (ø)
... and 10 more

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[meain]

Hey, thanks a lot.
The issue you created would be a good resource to have this that context, maybe drop in a link the issue next to it.
#423