Update README

code/DPDK_server_MDcache/README → code/DPDK_server_MDcache/README.md

+## DPDK for Mellanox Bluefield-1 ARM cores 
+
+1. Download the required DPDK compressed version & decompress it. 
+
+    https://core.dpdk.org/download/
+    
+    It is good to choose a stable (LTS) version 
+2. For Mellanox Bluefield NICs, check if the flag for Mellanox driver installation is set (for DPDK version < 20.11.8 only)
+
+    <path-to-dpdk-folder>$ vim config/common_linux
+
+    a. Check if the Poll Mode Driver (PMD) for your Mellanox NIC is set; in our case it is MLX5 
+    b. Add “CONFIG_RTE_LIBRTE_MLX5_PMD=y”, if it does not exist
+
+3. DPDK configuration alternatives
+    - Alternative 1: For newer DPDK versions (>= version 18)
+
+    <path-to-dpdk-folder>$ meson build
+
+    <path-to-dpdk-folder>$ cd build
+
+    <path-to-dpdk-folder>$ ninja
+
+    <path-to-dpdk-folder>$ ninja install
+    
+    - Alternative 2: For older DPDK versions & for our mTCP setup
+
+
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 ####
 DPDK
 #####