Added cramfs to readme

readme.md

@@ -5,14 +5,15 @@ There is possible to add or update files in ramfs image.
 
 ## Supported image formats
 1. Kernel: compressed raw, fit, android, raw, legacy
-2. Ramfs: cpio, ext2, squashfs, compressed cpio or ext2, legacy, fit, android image
+2. Ramfs: cpio, ext2, squashfs, cramfs, compressed cpio or ext2, legacy, fit, android image
 3. Device tree: dtb, fit
 
 ## Supported filesystems
 Supported at now:
 1. CPIO ASCII (RW)
 2. EXT2 (RW)
 3. SquashFs (RW)
+4. CramFs (RW)
 
 ## Supported compression types
 Supported at now:
@@ -108,6 +109,10 @@ Load fs from squashfs image:
 ```
 load <filename.sqfs> ramfs squashfs
 ```
+Load fs from cramfs image:
+```
+load <filename.sqfs> ramfs cramfs
+```
 
 ### Kernel image
 Load kernel from raw binary image:
@@ -156,6 +161,11 @@ store <filename.fs.ct> ramfs <compression>
 ```
 (compression) is "gzip", "lz4", "lzma", "bzip2"
 
+Store fs as cramfs image:
+```
+store <filename.cramfs> ramfs cramfs
+```
+
 Store fs as squashfs image:
 ```
 store <filename.cpio> ramfs squashfs
@@ -204,7 +214,7 @@ Update filesystem type:
 ```
 set ramfs filesystem <fs>
 ```
-(fs) is one of 'ext2', 'squashfs' or 'cpio'.
+(fs) is one of 'ext2', 'squashfs', 'cramfs' or 'cpio'.
 
 Change squash compression type:
 ```