README.md: Should provide example output.

Author: mashu

README.md

@@ -29,14 +29,41 @@ Pkg.add("RepertoireMetrics")
 ```julia
 using RepertoireMetrics
 
-# Read and analyze a repertoire
-rep = read_repertoire("data.tsv", VJCdr3Definition())
+# Read a repertoire file (supports .tsv and .tsv.gz)
+rep = read_repertoire("sample-001.tsv.gz", VJCdr3Definition(); 
+                      length_column=:cdr3)
+```
 
-# Compute all metrics (default)
-metrics = compute_metrics(rep)
+```
+Repertoire{Int64}:
+  Donor:      sample-001
+  Lineages:   15420
+  Total count: 198350
+  Top 5 lineages:
+    IGHV3-23*01|IGHJ4*02|GCGAGAGATCTTGACTACTGGGGCCAGGGAACC: 856 (0.43%)
+    IGHV4-39*01|IGHJ5*02|TGTGCGAGAGTCGATTACTATGATAGTAGTGGT: 724 (0.37%)
+    IGHV1-69*01|IGHJ3*02|GCGAGAGATAGTGGCTACGATTTTGACTACTGG: 512 (0.26%)
+    IGHV5-51*01|IGHJ4*02|TGTGCGAGACATATTGTGGTGGTAACTGCCCC: 398 (0.2%)
+    IGHV3-48*01|IGHJ6*02|GCGAGAGGGGATAGCAGCAGCTGGTACTTTGAC: 287 (0.14%)
+    ... and 15415 more
+```
+
+```julia
+# Compute selected metrics using the composable + operator
+metrics = compute_metrics(rep, Depth() + SimpsonDiversity() + Clonality() + GiniCoefficient())
+```
+
+```
+Metrics (4 computed):
+  depth: 198350.0
+  simpson_diversity: 0.9997
+  clonality: 0.0612
+  gini_coefficient: 0.548
+```
 
-# Or select specific metrics
-metrics = compute_metrics(rep, ShannonEntropy() + Clonality() + D50())
+```julia
+# Or compute all available metrics (default)
+metrics = compute_metrics(rep)
 ```
 
 ## Documentation