add readme

readme.md

+#  nd2 to tif tools
+
+## Compress nd2 to tif with 4x binning and 16 to 8 bits conversion
+
+### Use:
+
+`python -m nd2shrink path_to_nd2`
+
+# combine several nd2 into tif time series
+
+### Use
+
+`python -m nd2_combine folder`
+
+#### Input:
+
+- Folder:
+  - D1: 
+    - condition1.nd2
+    - condition2.nd2
+  - D2:
+    - condition1.nd2
+    - condition2.nd2
+
+#### Output:
+
+- Folder:
+  - Compressed:
+    - condition1:
+      - Pos_001.tif <- D1, D2 images for well 1
+      - Pos_002.tif <- D1, D2 images for well 2
+
+
+