Update README.md

Author: tatarize

README.md

@@ -118,6 +118,8 @@ Pyembroidery will write:
 * .pec
 * .csv
 * .svg
+* .png
+* .txt
 
 Pyembroidery will read:
 * .pes (mandated)
@@ -166,6 +168,12 @@ Prints out a workable CSV file with the given data. Starting in 1.3 the csv patt
 
 `write_csv(pattern, "file.csv", {"encode": True})`
 
+Writing to PNG:
+Writes to a image/png file.
+
+Writing to TXT:
+Writes to a text file. Generally lossy, it does not write threads or metadata, but certainly more easily parsed for a number of homebrew applications. The "mimic" option should mimic the embroidermodder functionality for exporting to txt files. By default it exports a bit less lossy giving the proper command indexes and their explicit names.
+
 Reading:
 ---
 
@@ -227,6 +235,8 @@ pyembroidery.write_jef(pattern, file)
 pyembroidery.write_u01(pattern, file)
 pyembroidery.write_svg(pattern, file)
 pyembroidery.write_csv(pattern, file)
+pyembroidery.write_png(pattern, file)
+pyembroidery.write_txt(pattern, file)
 ```
 
 In addition, you can add a `dict` object to the writer, reader, and converter with various settings.