Add R scripts to plot performance charts

Change-Id: I20d33a47722f515897c79e9e58c49f6391e48eac
diff --git a/charts/single_bar_perf_chart.R b/charts/single_bar_perf_chart.R
new file mode 100644
index 0000000..c1e9757
--- /dev/null
+++ b/charts/single_bar_perf_chart.R
@@ -0,0 +1,16 @@
+df <- read_tsv("performance.tsv")
+ylabel <- colnames(df)[7]
+colnames(df)[7] <- "perf"
+df %>% 
+  fill(Tool) %>%
+  filter(Tool!="wc", !is.na(perf)) %>%
+  arrange(desc(perf)) %>%
+  mutate(tool = paste0(Tool, if_else(is.na(Model), "", paste0(" (", Model, ")")))) %>%
+  mutate(Tool= factor(tool) %>% fct_reorder(perf)) %>%
+  ggplot(aes(x=Tool, y=perf)) + 
+  geom_col() + 
+  ylab("Tokens/ms") +
+  xlab(NULL) +
+  coord_flip()# +
+#  geom_text(aes(label=perf), position=position_stack(vjus=0.5), hjust=0.25)
+#ggsave("/tmp/tok_perf.png", width = 70 * .pt, height = 40 *.pt, units = "mm", dpi = 600)