adds README for srcjar directory

diff --git a/srcjar/README_SWINGJS.txt b/srcjar/README_SWINGJS.txt
new file mode 100644 (file)
index 0000000..d6c8041
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+++ b/srcjar/README_SWINGJS.txt
@@ -0,0 +1,8 @@
+The srcjar directory is not on the classpath. It is a staging and reference 
+directory for temporary placement of dependency jar file source prior to and 
+after conversion to JavaScript. 
+
+The src2 directory is used to actually build the .js files, as it is on the
+class path. See README_SWINGJS.txt there. 
+
+BH 2018.07.20
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