Add concurrent programs: picosh, httpd, ringbuffer, mbus

Author: jserv

README.md

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+# Complementary Programs for course "Linux Kernel Internals"
+
+## Project Listing
+- [picosh](picosh/): A minimalist UNIX shell.
+- [httpd](httpd/): A multi-threaded web server.
+- [ringbuffer](ringbuffer/): A lock-less ring buffer.
+- [mbus](mbus/): A concurrent message bus.
+
+## License
+
+The above projects are released under the BSD 2 clause license.
+Use of this source code is governed by a BSD-style license that can be found
+in the LICENSE file.

httpd/Makefile

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+httpd: httpd.c
+	gcc -Wall -Wextra -o httpd httpd.c -lpthread
+
+clean:
+	rm -f httpd
+
+indent:
+	clang-format -i httpd.c