Created nlohmann::basicjson::erase (markdown)

nlohmann::basicjson::erase.md

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+```cpp
+iterator erase(iterator pos);
+const_iterator erase(const_iterator pos);                               // 1
+```
+```cpp
+iterator erase(iterator first, iterator last);
+const_iterator erase(const_iterator first, const_iterator last);        // 2
+```
+```cpp
+void erase(const size_type idx);                                        // 3
+```
+```cpp
+size_type erase(const typename object_t::key_type& key);                // 4
+```
+
+## Description
+
+Removes specified elements from the JSON value.
+
+1. Removes the element at `pos`.
+2. Removes the elements in the range [`first`; `last`).
+3. Removes the element at index `idx` (only works for arrays).
+4. Removes the element with key `key` (only works for objects).
+
+Invalidates iterators and references at or after the point of the erase, including the `end()` iterator.
+
+The iterator `pos` must be valid and dereferenceable. Thus the `end()` iterator (which is valid, but is not dereferencable) cannot be used as a value for `pos`.
+
+The iterator `first` does not need to be dereferenceable if `first==last`: erasing an empty range is a no-op.
+
+## Parameter
+
+- `pos`: iterator to the element to remove
+- `first`, `last`: range of elements to remove
+- `idx`: index of the element to remove
+- `key`: key of the element to remove
+
+## Return value
+
+1. Iterator following the last removed element. If the iterator pos refers to the last element, the `end()` iterator is returned.
+2. Iterator following the last removed element. If the iterator pos refers to the last element, the `end()` iterator is returned.
+3. None.
+4. Number of elements removed.
+
+## Complexity
+
+1. Linear in distance between `pos` and the end of the container in case of arrays; amortized constant in case of objects; constant otherwise.
+2. Linear in the distance between `first` and `last`, plus linear in the distance between `last` and end of the container in case of arrays; `log(c.size()) + std::distance(first, last)` where `c` is the instance of `ObjectType` in case of objects; constant otherwise.
+3. Linear in distance between `idx` and the end of the container.
+4. `log(c.size()) + c.count(key)` where `c` is the instance of `ObjectType`.
+
+## Exceptions
+
+1. `std::runtime_error` when called on null type.
+2. `std::runtime_error` when called on null type.
+3. `std::runtime_error` when called on non-array types. `std::out_of_range` when `idx >= size()`.
+4. `std::runtime_error` when called on non-object types. Any exceptions thrown by the `ObjectType::Compare` object.