Add README.md

haproxy/README.md

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+# Build HAProxy as static PIE
+
+Build the [HAProxy](https://git.haproxy.org/): The Reliable, High Performance TCP/HTTP Load Balancer as a static PIE ELF running on Linux.
+
+## Requirements
+
+Make sure the following packages are installed:
+* gcc >= 8 (required for the `-static-pie` linking option)
+* autotools
+* GNU Make
+* zlib development files
+* OpenSSL development files
+
+For Ubuntu, run the command below to install all requirements:
+
+```
+$ sudo apt install build-essential zlib1g-dev libssl-dev
+```
+
+## Build
+
+The `HAProxy` static PIE ELF is located in the current folder.
+If you want to rebuild it, run:
+
+```
+$ ./build.sh
+```