Add example configurations

.env.example

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+HOC_REPODIR='./repos'
+HOC_CACHEDIR='./cache'
+HOC_PORT=8080
+HOC_HOST='0.0.0.0'
+HOC_WORKERS=4
+
+HOC_BASE_URL='http://0.0.0.0:8080'

hoc.toml.example

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+# every parameter can also be set (or overwritten) by passing an environment
+# variable namend `HOC_<PARAMETERNAME>`, e.g.
+# `HOC_BASE_URL='https://hitsofcode.com' ./hoc`
+
+# these config parameters have default values and must not explicitly be set
+repodir = "./repos"
+cachedir = "./cache"
+port = 8080
+host = "0.0.0.0"
+workers = 4
+
+# these parameters don't have default values and must be set
+
+# this should be the public base URL of the service, e.g. `https://hitsofcode.com`
+base_url = "http://0.0.0.0:8080"