Update README with support information

[mazrean]

Added support section and related badge to README.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.34%. Comparing base (1e19487) to head (f2b9c67).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #68   +/-   ##
=======================================
  Coverage   52.34%   52.34%           
=======================================
  Files          12       12           
  Lines         426      426           
=======================================
  Hits          223      223           
  Misses        182      182           
  Partials       21       21           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[github-actions]

Benchmark Result

goos: linux
goarch: amd64
pkg: github.com/mazrean/formstream
cpu: AMD EPYC 7763 64-Core Processor                
BenchmarkFormStreamFastPath/1MB-4 	    2803	    408587 ns/op	   10013 B/op	      64 allocs/op
BenchmarkFormStreamFastPath/10MB-4         	     307	   3882341 ns/op	   10020 B/op	      64 allocs/op
BenchmarkFormStreamFastPath/100MB-4        	      27	  41187568 ns/op	   10619 B/op	      64 allocs/op
BenchmarkFormStreamFastPath/1GB-4          	       3	 424876876 ns/op	   18368 B/op	      66 allocs/op
BenchmarkFormStreamSlowPath/1MB-4          	    2635	    450813 ns/op	   11713 B/op	      69 allocs/op
BenchmarkFormStreamSlowPath/10MB-4         	     271	   4263987 ns/op	  133994 B/op	      69 allocs/op
BenchmarkFormStreamSlowPath/100MB-4        	       7	 153983932 ns/op	19220833 B/op	      80 allocs/op
BenchmarkFormStreamSlowPath/1GB-4          	       1	1649078662 ns/op	134286008 B/op	     103 allocs/op
BenchmarkStdMultipartNextPart/1MB-4        	    2553	    432370 ns/op	   39303 B/op	      32 allocs/op
BenchmarkStdMultipartNextPart/10MB-4       	     294	   3959766 ns/op	   39317 B/op	      32 allocs/op
BenchmarkStdMultipartNextPart/100MB-4      	      28	  41136438 ns/op	   39892 B/op	      32 allocs/op
BenchmarkStdMultipartNextPart/1GB-4        	       3	 422896855 ns/op	   44933 B/op	      33 allocs/op
BenchmarkStdMultipartReadForm/1MB-4        	    1294	    961365 ns/op	 4203827 B/op	      63 allocs/op
BenchmarkStdMultipartReadForm/10MB-4       	     136	   8563585 ns/op	33566602 B/op	      66 allocs/op
BenchmarkStdMultipartReadForm/100MB-4      	       6	 179848862 ns/op	134265684 B/op	      79 allocs/op
BenchmarkStdMultipartReadForm/1GB-4        	       1	1840559911 ns/op	134275432 B/op	      82 allocs/op
PASS
ok  	github.com/mazrean/formstream	28.315s

pprof command

gh api /repos/mazrean/formstream/actions/artifacts/4506582314/zip > /tmp/profile.zip
unzip /tmp/profile.zip -d profile
rm -rf /tmp/profile.zip
go tool pprof -http :6060 profile/cpu.out