Improvement try to add feature threading

.npmignore

@@ -0,0 +1,6 @@
+build/*.bc
+emscripten/
+src/*.jpg
+src/*.png
+src/output/
+tools/

README.md

@@ -85,4 +85,13 @@ e.g ` node app.js -i image.png -level=4 -min_thresh=8 `
 
 ## Build
 Build emscripten files with docker:
-docker run --rm -v $(pwd):/src -u $(id -u):$(id -g) -e "EMSCRIPTEN=/emsdk/upstream/emscripten"  emscripten/emsdk:3.1.26 npm run build-local
+
+    docker run --rm -v $(pwd):/src -u $(id -u):$(id -g) -e "EMSCRIPTEN=/emsdk/upstream/emscripten"  emscripten/emsdk:3.1.26 npm run build-local
+
+or better create a docker container and run the build command inside it:
+
+    docker run -dit --name emscripten-nft-marker-creator-app -v $(pwd):/src emscripten/emsdk:3.1.26 bash
+    docker exec emscripten-nft-marker-creator-app npm run build-local
+
+## Planned Features
+- [ ] Multi threading support to speed up the creation of the markers.

emscripten/markerCompress.cpp

@@ -0,0 +1,54 @@
+#include <emscripten.h>
+
+#ifdef _WIN32
+#include <Windows.h>
+#else
+#include <sys/stat.h>
+#endif
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <AR/ar.h>
+#include "zlib/zlib.h"
+
+static const char *zipname = "/tempBinFile.bin";
+
+extern "C"
+{
+
+    uint compressZip(char *src, int srclen)
+    {
+        FILE *fp;
+
+        char *b = new char[srclen];
+
+        printf("Uncompressed size is: %lu", strlen(src));
+        printf("\n----------\n");
+
+        z_stream defstream;
+        defstream.zalloc = Z_NULL;
+        defstream.zfree = Z_NULL;
+        defstream.opaque = Z_NULL;
+        defstream.avail_in = (uInt)srclen;
+        defstream.next_in = (Bytef *)src;
+        defstream.avail_out = (uInt)srclen;
+        defstream.next_out = (Bytef *)b;
+
+        deflateInit(&defstream, Z_BEST_COMPRESSION);
+        deflate(&defstream, Z_FINISH);
+        deflateEnd(&defstream);
+
+        printf("Compressed size is: %lu\n", strlen(b));
+
+        fp = fopen(zipname, "wb");
+        fwrite(b, defstream.total_out, 1, fp);
+        fclose(fp);
+
+        delete[] b;
+
+        return 0;
+    }
+
+} // extern "C"